US1468217A - Measured-service system - Google Patents

Description

2 Sheets-Sheet 1 INVENTDFx' F M SLOUGH MEASURED' SERVICE SYSTEM Filed June 11 Sept. 18', 1923.

Sept. 18 1923.

F. M. SLOUGH MEASURED SERVICE SYSTEM Filed June 11 1917 2 ShGbS-ShGSt 2 IN'VENTEIR Panacea Sept. 18,1923.

FRANKM. SLOUGI-L'iOF noonssrfsannw aonnfassronon ro srnoarnnes -oantson TELEPHONE icenurao'ronmecoriraur, or *soorrns'rna, new romgn oog PORATION' OF'NEW YORK.

ranasunnn-ssnvron SYSTEML- iApplication filed June 111 19 1;; sjer igtinbfiireise.

Be it known that I, FRANK SLOUQI-I, a citizen of the United States, residing at Rochester, in the county of Monroe-and- My invention relates to the measurement o't' telephonic servlce, andhas more particularly to do With theselectlve indicaticurand' selecthe registration of telephonic :calls originating in any one of the subscribers?- ions connected With and served by a lo tolcphoneline. lVhe-re charges for telephonicservice are based upon the number of calls made by a subscriber and several subscribers stations are served by the same telephone line, it becomes necessary, in order-correctly to apportion the charges among thevarious subscribers to provide for ascertaining at which one of the several stations of the line each call originates so that it may be enteredup. or charged against that station; and, when the identity of the calling station has been determined, it is desirable to provide suitable registering mechanism associated-With the lines for enabling theca-lls or" the different stations to be separately recorded and: totaled.

in accordance with the embodimentzot my inventionv herein described and illustrated, I provide at the central. oflice and associated with the line circuit .to which are connected a plurality of telephones,registers, one for each of the telephones connected to the lines, and I furthermore provide central otlice apparatus adapted to be associated with the connecting circuit which at the time is used to complete the connection from the said line to a called line which operating in conjunction withthe aforesaid registers and controlledhy suitable resist ani-e coils at each of the substations, serves to selectively register each call made, and to indicate vi ually to the operator which of the stations has initiated the call. I furtherniore provide visual iindicating iueans common to a plurality of connecting circuits under the control of the operator, for indieating to the operator at any time during connection which of the parties of a party line has initiated-the call.

Some ofthecentralofiicecontrolling ap V paratu's before neutioned,;is individualito the] connecting circuiq i the conne uemthe greater partof the appa ratiusfhoive ver, is common to an operators necting circuits,

position, or coinrnon to. aplur ality of conthee coil included inthe linecircuit of the 7' call ng substation toperforin the's electiverunction, a fter'the'saidfunctlon has been performed; Othernovel improvements will later appear. i

' Referring to the drawings, Fig. 1, shows a line toywhlchare connected four substa-' tilonsleadingto a line circuitat the main enchange, At thejinajin exchange-this 11m used. in completing circuit isfcoinposed otaline and a cut-off relayu'and in addition eight register control- Eng 93121375v Whose functions will belater de-l if scribed 7 associated jVltll these register' controlling relays WhiC-h, are in pairs, are four registers corresponding each to one' of the stations the telephone party line.

Aconnecting circuitiis also'sh oWn as indicated'T'at F, same being provided in t'he embodiment, illustrated, With terminal plugs at each'endio'r connecting the' c onnecting circuit With a calling and a called telephone In addition toth'e relays for performing the supervisory listening and ringing' conr trol functions ivhich are usual "in such connecting circuits, I have provided additional relays for the purposeof properly controlling the selective lIKliCEL'tlOILRHCl registrat on functionsqand I'have also associated with these relays the aforesaidrelays in orler. to

properly perform these last named func-.

t ons. p i

Certain of the relays'shown 1n the figure, are especially constructed to perform in a certain manner, the construction b ingmore specificallydescribet in pending application SerialNo. 135,636; such relays are.

shown as '11, 12 and 13; "Relays of other design, but having equivalent functions may however be employed in their place. I These relays have a plurality of -arn atures and a core extension; one of thearmatures "magnetically shielding: the other. 'The shielded armature Wlll not operate until the shielding armature has been "fully attracted, I thus 1essen1ng"the shieldmg and the shielding armature may be operated by rapid impulses of current without affecting the second armature at all, and

thesecond armature may be so adjustedthat the strength of current required to operate it must be ncreased over that required 'to operate 1 the iiirst or shielding armature.

With such a relay as atll, the first armature will be attracted on a certain value of current, and thereafter the second armature 7 may be operated bymtermittent impulses 0t current, provided the intermittent impulses are ofa sufficientlyincreased value, the value of current sufiicient to'operate the first armature being not sufficient to even hold the second armature in its attracted position. I make use of: such a relay adjustment only at 11; the relays at vl2'and 13 being given only such an adjustment as will preventthe shielded armature from operating on rapid impulses of current, but the shielded armature will operate on these relays if the current is maintained in the circuit or the relay winding long enough.

Figure 1 also shows interrupter-s 0 c c and c, which each give a train of impulses comprising one long impulse and a varying number of short impulses, theseinterruptcrs serving to operate therelays 11, 12 and l3 according to their several characteristics, and to. produce results" as will be later described.

At the substations, resistance coils r r 1' and '1", are provided in the form of electromagnots; these resistance coils being of various resistances; thevarmaturesfor these electromagnets are capable of being manua'lly depressed, and when-so depressed the windings of the electromagnets are operatively connected tothe circuit being nor- 'mally short circuited. When operatively connected the electromagnets will maintain the depressed position of the armature by magnetic attraction until the circuit is opened at the contacts of the relay 15 as will be later described. The registers a, Z), "a and (Z are so constructed'that they are not capable of being operated by rapid impulses of current, being sluggish intheir action and requiring time to operate.

Figure 2 shows a portion of the controlling apparatus common to a plurality of connecting circuits, and contains the apparatus requiredto translate the strength of current flowing into a definite number of step-bystep impulsesot current whichin turn cause 1 signals'to be displayed. and the register sysas will be later described.

Figure 2 shows at Y a balanced relay, the armature of which stands normally in mid, position between electroma'gnets, and being controlled by the. eleetromagnets is tem of Figure 1 to be selectively operated capable of being moved toward one or the other according to the 'relative' strengths of the electromagnets, and when so moved balanced relay Y for varying line resistances of the lines to which the apparatus may be connected. r

The group Z 1s the selective group and likewise is a kind of automaticstep-by-step current impulse operated rheostat, and serves to balance agalnst the resistance added to the hue resistance by the inclusion of sucha resistance electromagnet as may be inserted in the circuit as 7",, 9",, 71,01 13. Signal lamps are provided at 16, 11 18 and 19 common to the group of connecting circuits served by the apparatus of Figure 2, and are selectively operated to indicate which of the parties on the connected party line is operatively connected thereto.

l-laving thus above briefly described some of the apparatus of my invention, I will now to facilitate better understanding of the same describe its operation in the embodiment illustrated.

In the first place at A, B,C and D are shown four substations connected to the limbs of a party line L,. r The line wires and so I the instruments, that is the transmitter and receiver of the instruments shown in the drawing may vary in resistance as they will vary, in practice, and for the sake of description we will assume that the total re sistance of the line wires and acalling one of the instruments above mentioned are equalto :1: ohms. it is the'party at B that desires to make a call, and that the resistance of the electromagnet r 'at the station B is 3 ohms. The subscriber at B making the call will take his receiver from the hook where it normally rests, and the hook will thereafter close its contacts in the usual manner to cause the display of the line signal at the main office. A controlling circuit therefor will be closed including the source of" current E, conduc tors 20 and 21, the winding of the line relay 22, conductors 23, the normally closed contacts 24c of the relay 11, conductor 25, con- We will assume also that V scribed.

" teen,

ductor 34, the normally closed contacts oi the relay ll, and thence to ground at G which is connected to the positive pole. of

the source of current of battery E. Current will therefore flow over this'circuit froni the batteryll energ zing the relay which will attract its arr-nature closing its contacts36 providing an operative circuit for the line 36 of the relay 22, the conductor 37-, the

line lain JVZ ,tlieco nductor 38 {to-the round r v e 7., b. v pole G or battery \Jur 'ent Wlll now flow V oi'er this cii'cuitoperating the signal lainp Z and it will glow d recting the .attention of the operator to the call. The operator will then answer the call by inserting the plug P into the jack J of the calling line whereupon connection will be made between. the talking limbs of the lines 32 and 26 and the talking limbs of the connecting circuits 39 and lll, also between the winning of the cut-off relay 11 oi t he line .circuit and the local operating strand ll of the cord circuit.

The cut-oft relay will be operated over a circuit as followsz-From the negative pole ol battery Ej, the conductor t2, the normally closed contacts l3 of the supervisory relay let, the conductor elf), the conductor 46, the winding of therelay ll", the conductor 48,

the cooperating contacts 4L9 and of the plug and jack switch J the conductorv 51, the winding of the cut-oil relay 11, and con 52 leading to the ground pole G at battery E This circuit being closed current will llQWOYBY the same energizingthegrelay e7 and the cut-oil relay 11 of the linecircuit causing them to attracttheir arinatures and" v witchcircuits for purposes as willloe degized will attract its armatures 53 and-'54,

but will not attract its armature 55 because this armature is so adjusted as to require an increased flow of current to operate it as has been above; mentioned. and 55% being attracted will break the contacts 24; and 35 severing the connection of the line battery andlin'e relay 22 with the limbs of the lines 34: and 25. Also a circuit will he closed by the making of the contacts 56 for a purpose later to be described.

lie circuit of the liueirelay 22 being opened it will release its ai'inatures opening its contacts 36, and retire the line signal Z conductors-39 The connecting oi the talking and 40 of the connecting circuit to the tall:- ing conductors 26 and 33ott the line circuit will cause current to flow over thesevconductors and the line circuit over a path traced as follows :'Froni the negative. pole of the battery the circuit conduc relay 59,'the conductor 60, the conductor 61,

The cut-oil relay. 11 being eneiw The arinatures 53 J 1 anced rel ayi I tor 57. the, winding 58 of the answeringsupervisory 15, circuit conductor 40, cooperating contacts oftlieplu'g and jack switch 63 and 64%,

circuit conductor 26 of the line circuit L circuit conductor 27, the switch contactsQS oi the substation B,tlt11sn1lttr 29, receiver 30, now closedcontacts 31' oil the substation 7 I B the circuit conductor 32, circuit conductor 33, oftheline circuit L co-opei'ating.conf tacts 65 and 66, the plug and jacii switch P -wl Circuit conductor 39, circuit condiictor 67, circuit conductor 68 circuit cone,

ductor 69, the winding; 70 of the relay 59,

circuit conductor 7'1 and from thence to the groundpole of battery E Currentliowing over th s'circu t'ii ill energize the answering supervisory relay 59 causing itto attract its armature and close the contacts 72. The closing ofthesecontacts completes a circuit which may be traced as JiOllOElSv it eing understood that tlieattraction of the arinatures oi? the relay 117 had previously closed con tacts 73 and 7%; from the negative pole of the source 0t current at E the conductor 75, the iiowclosed, contacts 73 of therelay 4 7,

circuit conductor 76, now closed contacts 72 0f the relay 59," circuit conductor 77, circult conductor 78, the winding of 'therelay 7 9, the circuit conductor 80, now closed contacts 81 the relay 82, circuit conductor 83 leading to the ground pole of the battery 15,.

"Current will now flow over this circuit energizing the 'clay 79 which will attract its arinatures, each of which contacts in circuits later to be described; no subscriber on'fthe line L at the timecon nection was made with. this line by the con-Q i'iecting circuit, the v'supei'yisory lamp St would be lighted through norinal contacts 85 of the supervisory relay; 59, and now closed contacts 'li olt therelay 41in the well-' known manner. :The relay"!- 9 being ope atechcontacts 86, 8? and 88 will be close for a purpose to he described; first battery current E by means or". conductors 89, 6, the conductors 6 cl? F If there were the contacts 88 being closed connectsthe source. of

iio- .2, and from thence to negative batterysupply leads of 7 Fig 2, as will be later inoi c specifically mentionedQ v l Referringnew more particularly to Fig. 2, at Y is showiiwhat has been termed a bal- This relay has balanced armature 90 standing midway between the poles of the electroinagnets 91' and 92yand correspondingcontacts 93 and 9%. This is.

the position the armature would take ii 'the electroinagiiets are equal in strength. 7 However, w th the circuits connected up as they are in the drawing of Fig. Zand priortothe operation of the relay 'ZQ of Fig. 1. which as the armature would be at has been described,

tracted toward the pole of the in p ing the contacts 9%. Thecircu for the magnet 92 would be traced as follows :-Froin the negative pole of battery E the resistwould pass current from the source of our- *1 rent 1* 7 The resulting closure of the contacts 94 would be without effect so taras the operation of any of the circuits 1S concerned until such a'relay isener s'ized as the relay 79 of an associated connecting circuit, such as the connecting circuit shown in 'Fig. 1 whose operation isbeing described in connection with the circuits of Fig. 2, and which is designated in the drawing as connecting circuit F. Further the relay '79 being operated and battery being supplied to the common battery supply lead Fig. 2 as has been described, the closure of contact 94 will complete a circuit for current flow as follows A From the ground pole of ba'ttery,the conductor 95, the conductor. 96, the armature of the'balanced relay Y. the closed contacts 94 thereof, the. circuit conductor 97, the normally made contacts 98 of the relay 99, the circuit conductor 100, the winding of the relay 101, circuit conductor. 102,-circuit conductor 103 to the conunon negative battery supply lead 6 whose further circuit has been. previously traced through the contacts 88 of the connecting circuit '79 to negative pole of battery'E This will causethe operation of the relay 101, and this relay will attract its armaturesft'or purposes to be described. First, the contacts 104 of therelay 101 are closed connecting the ground pole of battery through the circuit conductor 105 to the winding of the relay 99 there by conditioning the relay 99' to operate in series with the relay 101 whenever the short circuit of the relay 99from ground pole of battery to ground pole of battery through contacts 94 of the balanced relay Y. is removed. However, for the moment the magnet 99 being short circuited will remain de-encrgized. The contacts 106 are also now closed to condition the relays 107 and 108 for operation, which operation will be later described. 7

The contacts 109 and 110 of the relay 101 are also closed. completing a circuit for the windings of the electromagnet 91, which windings are thereby placed in multiple with the windings 58 an'dTO of the relay 59, and therefore the current flowing over the line and through the subscribers instrument will be divided, part of this current flowing as has been described through the windings of the supervisory relay 59, and a part flowing over the divided circuit including conductors 111 and 112, the now closed contacts 86' and 87 of therelay 79 of Fig. 1, the circuit conductors: 4 and 5,-the circuit conductors 4"and'5 of Fig. 2', the

now made contacts 109 and 110 of the relay 101,,the circuit conductors 113 and 114, the

windings 115 and 116 of the electroinagnet" battery, although" di fi'e'rent batteries may be But for convenience and simplicity used. of representation the batteries are shown in many places rather than to show common battery leads leading to a common battery.-

The windings of the electromagnet 91 being placed in parallel therefore withthe windings of the relayf59, the electromagnet 91 will be energized in proportion to the In 'passingit maybe stated that although flow of current overthe' line wires leading to the subscribers station, and will exert a pull upon the armature 90 tending to withdraw it, from the position adjacent to the core of the electro1'nagnet 92', and to cause it to close contacts 93 instead of contacts 94. At this point in'the operation the strength of energization of'the magnet 92 .is arranged to be very weak as compared with the strength of energization of th magnet 91 when the magnet 91 is connectedv to any or" thelines of the telephone system adapted to operate in connection with th apparatus described. In other words the efi ect of the resistance of the circuit including the winding of the-inagnet-92 is ar ranged to'berelativelyhigh at this stage'of the operation as compared with the effect of the line resistances. Therefore, when the magnet 91 is energized by current over a;-

telephone line as just described, it will first withdraw the armature from the contacts'94 causing it to close contacts 93, this being'the invariable operation with any of the lines with which it isproposed to operate this system. The'opening of the contacts 94' destroys the short circuit previously men tioned which had been established around the winding of the electromagnet 99 from ground pole of battery toground pole of battery, and the relay 99 will therefore now be operated over'a circuit from the ground pole of battery, the now closed contacts 104 of the relay 101, circuit conductor 105, the winding of the relay 99, circuit conductor 100, thewinding of the relay 101, circuit conductor 102, circuit conductor 103, and

from thence to the negative poleof battery over thepreviously operated circuit to nega tive battery including the common battery supply conductor6. The relay 99 being closeditsar nature will be attracted and open the contacts 98, and extend the conductor 97 to the conductor 122 by means of noiv closed contacts However, this closure of the balanced relay Y. Thecircuit from the contacts 94r,b} means of conductor 97 being extended by conduct-or 122 for a pur pose later to be described and operative when the contacts 94 are again closed as will be later described.

The armature 90 being caused to close contacts 93 as above related,- a circuit is closed for the flowing of battery-current as tolloivs:Froin the ground pole ot-battery. circuit conductor'95, circuit conductor 96, the armature 90 of the balanced relay Y, now closed contacts 93 thereof circuit conductor .12 1 the normallyxclosed contacts 125 or the relay 126,- circuit conductor 127, the Winding of the relay 108' circuit'fconductor 109; circuit conductor 110, the DOW circuit tor tllGhVlYKllIl? of the relay 1%, 'Wlilill winding will for the'present however,- bc short circuited hy'having uroundpoleof' batiery connected to the opposite'sides of the winding throughcontacts131 of the rela 106 on the one side, and through contacts 125 of therelay 126, and through contacts 9 of the balanced relay Y on 'the other side. This short circuit will remain about the winding; of the relay 126 until the contacts 93 are later opened as will be later described,

and at which time the Winding ofthe relay 126 will be connected in circuit vith the relay 108 as will be late'r described.

When the relay 108 was energized the contacts .132 and 133 werealsoclosed, Theclos ingot the contacts 133 completes the circuit of the winding of the relay 107 astolloivs From the ground pole of battery. the contacts 133 of the relay 10S, circuit conductor 13a; and the winding of therelay 107,.circuil conductor 135. circuit conductor 110, the

contacts 106 oil the relay 101, circuit conduc- {tor 169, now made contacts 132 otthe relay .1O8 circuitconductor 170. normally made contacts 171 of the, relay- 172, circ it conductor 173', now made contacts' 17 1 ot-the relay126,-cir'cuit conductor gl75, novveclosed contacts17 6 of the. relay 177, circuit-con.

tors 1 8. 129, 131), 103, and cominon negative battery conductor '6 leading to negative battery as has been described; 'Thus will the relay 107be operated attraciiiig its I The closing or? these contacts connects the la llllefi and closing contacts 136 and 137.

operators circuit shown at O'to'thc talking conductors of the connecting circuit which as has been describedare now connected to the subscribers telephone 1 over theflsubscribers line circuit, the connection being extended from the operators circuit .to the talking conductors of the connecting circuit by'means of conductors 188and' 139,: contacts 136 and 137 of the relay 107 conductors 140 and 141, contacts 109 and 110 of the relay. 101', conductors-4l and 5 of Figxl the now closed contacts 86 and 87 of the con-- necting. circuit relay 79,.con'diictors111: and 112, the normally closed pairs ct contacts 62 0f the releasing relay 15. and from thence by means of'coiiductors 67 and 142 to the talking strands of the ,connect-ing circuit 39 and H); and from thence to the s ibscribers station. The operator'is thusplaced iniconversational circuit with the subscriber. and:

can request the number of the lin'e desired in order to makeconnectionu" W hile jshe'is doingthisythe apparatusoifli'ig. 2 is performing the line ing line including line Wire's. telephone substationapparatus of thecalling station, etc.

This is necessary "because "many lines vary' considerably in resistance also the telephone substation apparatus may vary in resistance,

and it is desired to reduce "all of the lines to a common basis before proceeding further with the operation offthe system. T

The balancing function is performed by the reduction of the resistance of the circuit of'the Winding ot' the magn'et 92. This is accomplished by operatingra certain number.

7 balancing function; J .namelybalan'cing the a'ppai'at isgof'c Fig. 2 tor'fthe particular line resistance ot'thecailof the relays ofthe-fgroiip' X, and therefore 7 at this stage of. the operation these relays are operated, one at a tiineiiintil suflicient resistancehas beenciit,oiit of: the. circu t by the short circiiitingflot the proper niiinberoi circuit completed includingthe intermittent contact DJQkGI'OI interrupter I, and therelays. of the group X in sequence, operating these relays in order. theoperated relays be ing; operatively locked-after being energized, each of the relays shortjcu'ciiiting one of the resistance coils above mentioned when the relay is energized; The niethodof operating these relaysand the/circuits to cause their operation will now be '(iQSCIIbGCL The first circuit completed leads from the groi'indpolc of battery, conductor 166; the segment 167 of thointerrupterlithe brush-168 conducductor 17 8, circuit. conductor 179, the windrelay 180 be operated by current flowing over this circuit and through its winding and it will" attract-its a-rmatures closing contacts 182 and 1 83. The contact 183 being closed will condition the relay 177 for operation whenever the-seginent167'ot the interrupter I'breaks contact with the brush 168 thereof,"th'us removingthe short circuit now established'around'the Winding or" the relay 177 51-0111 the ground pole ofhattery to the ground pole .of battery.

"The contacts 182 being closed will shortcircuit the resistancecoil 153 in the-circuit ot' the magnet 92 otthe balancing relay Y.

Vthereby strengthening the energiz'ation of,

this nia 'netdefinite amount." lVe'will as- 23 surnethat it doesnot strengthen it enough 'tocause it to withdraw the armature 9O 01" therel ay' -Y from its position where it com tactswitli the contact the intermittent interrupter I will revolve until theconnection between the conductor 166 and the conductor1f67 by means of the brush"168 and the segment 167 is 'broken, whereupon the short circuit will be removed frcin about the winding of the relay 177, and the relay 177 will thereupon be energizedyattiacting its arinat-ures for purposes later to be described. i

Fhe energizing circuit for the relay 177 will now be as followsw l roin the ground P018011 battery, now closed contacts 183 of the relay 180,"circuit conductor 184; the winding of the relay 177, circuit conductor 179', the winding of the relay 180, circuit condiirt-or 181, and from. thence to negative battery and over the path which has been previously "described, comprising in part the conductors182, 183, 129,130, 103, conductor 6, etc. The relay 177 thus bein energized by current flowing oyer this circuit and attractin it's arinatures will cause an additional reduction of resistance in the circuit of the magnet 92 by the closing of contacts 185 which shortcircuits resistancecoil 11%. lVe will assume that the increased How armature 90 from a position where the con-- attrirctethwill break the contacts 176 and close contacts 187, extending the circuit including the interrupter I from" thepair of rel'ays180-477 to the pair ofrelays 188- In such a case balancing thereof.

189, and the interrupter-I=c ntinuing to re volve and again causing the segn'unt 167 to contact with the brush 168, a circuit will be closed comprising the windingof the relay Y 169, contacts 1320f the relay 108, circuit conductor 170, normally closed contacts 171 of the relay 1,72, circuit conductor 173, normally closed contacts 174 of'the relay 126, circuit conductor 17 5, now closed contacts 187 of the-relay 177 normally;

closed contacts 190 of the relay 189, circuit conductors 191 and 192, the windin g of'the' relay 18 8, circuit conductors 193, 182, 183, 129, 139, 1.03, 6,6 of Fig. '1, the now closed, contacts 88 of the relay 79 and conductor 89 to the negative pole of battery E .Qver this circuitcurr'entwill flow from thei's'ource ll energizingthe relay 188 which will now attract its armat'ures, justaswas the case with the relay 180 otthe first pair of relays 1 177, conditioning a circuit tor-tlie"subsequent operation of the second relay 189 of the pair and short circuit'the resistance 152 inthe circuit of the nagnet 92. The relay'189 is for the present inoperative because of the short circuit about its winding, comprising in part the contacting brush and segment of the interrupter I, just as was the case in the relay 1-77 of the firstcpair' of relays, and the relay 189 will besubsequently operated whenever the interrupter I interrupts the circuit of the short circuiting conductor leading to. the

ground pole of battery;

Assuming that the energization due to the short circuit of the resistance 152 is still insufficient to operatively change the position of the armature 99 of the balanced rclay Y, the interrupter l breaking the circuit of the conductors leading t it will cause the relay .189 to operate in a manner which will now-be understood, and; in'turn thecir;

cuit of the conductor 17 5 will be extended to the pair of relays 194- aud 195 which will in turn short circuit their associated resist inc of the 'inagnet 92 of the balancingrelay Y have been cut out of this circuit thereby increasin the flow of current through suilicient to cause the balancing relay Y to operatively inove the armature 9010f the relay. Y to open the contacts 93 At this stage'of the operation the current from ,overthe line energizing the electro igieeair magnet 91 produces approxiinately the same effect on the armature 90 as thG'GlGC- iromagnet-92 included in circuit with the resistance coils 14:6 "to' 161- iiiclusive. In

other Words, enough of the resistance coils 146 to'161 have been cut outofeircuit'to produce an overbalanced condition of the relay Y, the number of coils necessary to be ratus contained rut out depending upon the resistance of 208, the now closed contacts 181Iof the relay 108, the Winding-0f the relay 126,- C11:

cuit conductor 1275 11118 winding of th e relay 1.08, circuit conductor 109, circuit conductor 1lO,-rthe no\v closed contact's'106 or" the relay 101, circuit conductors 129, 130," 103,6;5 of Fig. "1, the novv closed contacts 88 of the relay 179, and circuit conductor 89 leading to the negative pole battery E Over this 7 circuit curr nt Will ilOW energizing-the relay 126; The contacts 17-1- leading to the group of relays Y will now be opened, these contactsbeing interposed inthe circuit conductors leading to the group of relays r from the interruptcr I so that. the group of relays X Will be 'i'roin now on in the operation of the syctein unefiected from the interrupter I; 0

Conductor 12-1- is novvdiscoiinected by the breaking of the'contacts 19 5 of lhGl'GltLy 1-36 "from the windingof therelayslQG and 108 and is extended by means oi circuit ci'inductor 201 and now made e-ontac'tsQOl to 'i OlId a permanent energizingcircuit for the relay 1'72 as will be describeiihthis 'occiirring Whenever the contacts 93 oi" the hat ancing relay are again closed as will be later described. r i' An energizing circuit is now closed "for the signal lamp 203 as followsz-trom the ground pole of battery, now closed contacts 204- of the circuit (:0 luctors 205, 6, 6 6i" Fig. l. the now closed contactsSS of the relay 79, and circuit conductor 89 to. the negative pole of battery Current will flow over tliis cii' cuit energizing the signal lanip 203 and.

ap 'n'ising the operator that she is operatively connected to the telephone line. to

which shehad previously made connection with the plug P of the cord circuit 1?; and apprising' her complete. v i

The operator will now upon observing the signal lamp 208 which 1 isiiow lighted, ad-- 7 vise the calling subscriber to depress his regprises the c tacts 94 ot the balancing r lay Y, and relay 126. the signal lainp 903,-

that the balancing function 7 being Z nterr ted, t

is 'r huttonysuch as 226 if it is the station E railing, and this being done the short y 1 about the iviiii ling 1' torinedby contacts 3-1 of the button 226. ivill he removed, anttthebutton 226 being in part an varnianaii depressed as longas battery from over the line flows through the w nding 01;

the resistance electroinagiiet r and the con- .tacts 31 will remain open as long as current flows over, the line. The depie'ssing ot this button Will add to the resistances included in the'line conductor 32 by an amount equivture for the electi'oinagnet 1 the key will aleiit' to theresistance g of the electroma gnet T end this resistance being different for the diiiterent stations orf'the line, the resist ance of the electroniagiiet will be a measure r to indicate vhich of the stations is calling;

the nie'thod o ,translatinp'tthis measure will:

:he noWjuesc -ibed. Theline resistance befhus increased thecurrent thronghthe j vindings of. the: ele'ctroinagnet 91. Which' is in cireiiit -with the line will be decreased and the contacts 9% of the balanced. relay Y will :be again closed. 1

Th... completes a circuitfor the relay 1 64 i s follows:'froni the ground'zpoleof battei'y,fcondiictor 95., conductor 96, armature 90, the iiou', closed contacts 94 oftl e bah i aiiced relay Y, conductor 97, now closedco'ritacts 12301? the relay 99, circuit conductor normally closed contactsQZ'? oi the relav circuit conductors 229 2111(l'230 the:

winding of the relay 164, circuit conduetois .231. 129.130, "1 03, 6 6 of Fig. 1,iio\v closed the relay lti r to he energized and will attract its ai'niatui'es, audrlose contacts 2U) ando'peii contacts 103i .The closure oi" the contactsf2l9 will condition a. circuit tor the operation at the relay F228 Whenever the short "circuit placcdabout the-winding; of

the relay 2528 has been reinovcdbythe :t'nrther operation otthe contacts of the ,halauciii'g -e 'ay Y. This short circuit conicued poleot battery placed on Y either-side oi'ihe winding by means of rimon; ot the rel y 16a; The relay -28 is tacts clusive'. The normally the rel y let-tot e groundpoleof-battery 4 r hecircuit of the' con- 7* therefore inoperi-rt ve until this short cir cuit rein-over QS'XVlll be later tiesc-nhed,

sistance Of'ill associated cir- 'clusion o't'the resistance coilsQl 2 to 24;7 inp -cir'cu'it'or' tie conductor 162 ductor 162 now leads to ground through all of the resistance coils 282 to 247 inclusive.

In the system of my invention the sum ot these resistance coils 232 to 247 inclusive is arranged to be sufliciently high that it will more than counter-balance the effect upon the balanced relay Y, produced by the inclusion of any of the resistances 7 7' and r, in the circuit the e ectromagnet 91 ot the balancing relay Y. Therefore, the balancing relay Y will now be effected by the inclusion of this added resistance in the circuit o'f the electromagnet 92 to so decrease the encrgization of the electron'iagnet 92 that the electromagnet 91 will be over-- powering in its effect upon the armature 9 0,

the contacts 94 of the balancing relay Y will be opened, and then the contacts 93 will be closed. The opening of the contacts 94 removes the short circuit which has been described as having been placed about the winding of the relay 228 so that the relay 228 is operated, its winding being placed in serial circuit with the winding of the relay 164 across the poles of battery. The energizing circuit "now being from the ground pole of battery, contact'165, closed contacts 219 of the relay 164, conductor 220, the winding of the relay 228, conductor 230. the winding of the relay 164, conduct-or 231, and from thence to negative pole or battery over conductors 129, 130, 103, 6, 6'ot Fig. 1, contacts 88 of the relay 79, and circuit conductor 89.

The relay 228 being operated will break the contacts 227, thus opening the extended circuit of the contacts 94 so thatthey will no longer be effective in the operation of the system and the contacts 221 will be closed completing; a. circuit from the negative pole of battery from the common battery supply conductor 6 to the winding; of the relay 172 as tollows:negative battery supply conductor 6, conductors 129--222, the contacts 221, circuit conductor 223, the winding ot the relay 172, and "from thence over conductors 224 and 225, normally made contacts 248 or" the relay 249, conductor 201, closed contacts 202 of the relay 126, conductor 124. through the just closed contacts 93 of the balancing; relay Y, the armature 90 thereof, circuit conductor 96, conductor 95 to the ground pole ot battery. This will cause the relay 172 to be operated extending the circuit leading; from the ground pole of battery through the interrupter I, to the group of relays Z. These relays are now in operative circuit arranged to be sequentially operated one at a time in a manner identical to the sequential operation of the 'group of relays. and the details of this sequential operation it' is therefore unnecessary to relate except with the c rcuit by which the lnterrupted connection to ground -is carried through: the interrupter and effected as'will be later related.

conductor 169, the now closed contacts 132 of the relay108, circuit conductor 170, now closed cont-acts 2590f the relay 172, normally closed contacts 251 of the relay 249,

circuit conductor 252 leadingto the arma-' ture 'ot the relay 254, and thence to through the group of relays thereof traced as follows :from the ground pole of battery, conductor166, the segment 167 of the interrupter Lthe brush 168 thereof, the

normally closed contacts 255 thereot over circuit conductor 256, through the winding of the relay 257, the conductor 258, the conductor 183, and from thence to the common negative battery supply conductor 6 by means of conductors 129, 130 and 103.

In passing it willbe seen that the common negative battery supply conductor 6 controlled =by contacts 88 ot the relay 79 of Fig; 1' controls the entire connection with" negative battery ot allthe circuits local to Fig. 2, and these circuits will theretorebe restored to normal whenever these contacts 7 88 are opened.

The circuit just traced for the relay 257 establishes a path for battery through the 234, 245, etc. have been short circuited; and 4 the resistance of. the entire circuit in which they are included sufficiently decreased to allow a sufficient current to flow over this circuit and through the winding of the electromagnet 92 to cause this electromagnet to overpower the effect of the electromagnet 91, at which time circuit changes will be 7 One of these circuit changes is the removal of the short circuit heretofore existing about the winding of the relay 249, consisting in part of the circuit conductor 225,thc contacts 248 of the relay 249, circuit conductor 201, coni tacts 202 of the relay 126, circuit conductor 124, contacts 93 ot' the balancing relay Y and the armature 90 thereot which is iconnected to the ground pole oi the source of current.-

The'armatu're 90 in response to the current flowing through the electromagnet 32, beforedescribed, breaks the contacts 93 and the short circuit'about the winding of the relay 248' is removed and the relay 248 is thereby operated in series with the relay 172 and, closed contacts thereof.

At the time therelay 249 was operated contacts 248 were opened, thus disconnecting the initial operating wire 201 from the relays 249 and 172. Also the contacts268 were .closed at which time the signal lamp 264 will be lightediover a circuit comprising the common negative battery supply conductor 6, circuit conductors 103'and 1'30,

the signal lamp 26 1, the conductor'268, con-1 tacts 263 of the relay 229, the conductor 265, and from thence to the ground pole of subscriber has obeyed'instructions and has" depressed the registration button.

We will assume for the sake of descrip-I tion that when the resistances 232,247, 233., 2&6, 234e, 24:5, 235 and 2-14 have been short; circuited by their-associated relays that the elimination of the resistances'of these coils is enough to cause the balancing relay to again be momentarily balanced, therefore,

the amount of resistance contained in these COllS is a rough measure of the amount of resistance added to the circuit of the tele phone line by the inclusion of the resistance electromagnet a, of the substation; and there'- fore, again the number of operated relays associated with these resistance coilspeach of which short "circuitsits associated resist-.

ance coil, is also a rough measure of the reslstance of the COll 7",.

Now, lamps 19, 18,17 and'16 are operatively connected .acrossithe terminalsjo'l' the battery, the particular lampconnected de pending upon the particular numberof relays of the group Z which are operatedg As the relays 257, 259, 260, etch-are. successively operated, the lamps 19, 18, 17

and 16, or some of them depending upon the number ofrelays operated, will be s.ucces-' sively flashed. 7 With the assumption that the relays 257, 254, 259, 260, 261, 262,266 and 267 alone are operated to cause thebal-v anced condition of the relay Y, then signal lamp 18 will be continuously connected across the terminals of battery over a circuit as follous:from the ground pole of battery, conductor208, conductor 265, the contacts 26-3 of the relay 2 19, circuit conductor 269, now 1nade contacts 2700f the relay 254:. the now made contacts271' of the relay 260, the now made co-n'tacts 2'72 of the relay 262, the now made contacts 273 of the relay 267, thenormally made contacts 27 1 of the relay 2,75,'circuit conductor 276, the signal lamp 18. circuit conductor 277, circuit conductor 258, circuit conductor 183, circuit conductors 129, 130, 103, the'coinmon negative battery supply conductorfi, and

from thence to the negative pole of battery through the controlling contacts 88 of the relay 79 of Fig. 1. V r

It will be seen that if the relay 275'had also been operated it would be the lamp 17 which Would'remain lighted, and in like manner either of the other lamps16 or 1 9 m1ght'hayc remained lighted depending upon the numberof the 'relaysof the group ZoperatedQ At the "time-the lamps 19, 18,

etc, are successively flashed there will be a momentary flow of current over divided'circuits' of these lamps, including"conductors 10, 9, 8 or 7 as the case maybe depending upon the number of relays'operated,an d the successive momentary [current impulses transmitted over these conductors will be carried through the contacts 298, 278, 299 and 300, or a'ce'rtain number of these con-V tac'ts successively, operatingfrelays 287 280, I r so,

286 and 285 ora certain number of these relays. Such of these relays as may be op era'ted" will be locked in circuit through their own contacts, and over circuitconductors individual .to the connecting circuit FL 7 Assuming as u ehave, that only therelays 262, 266 M1267 are operated to balance the relayY, then in such a case the relays 287 and 280 Will.- be successively operated and locked in circuit, the relays 286and 285remaininginert; The first armature 10f the relay 287W1ll be operated closing contacts 282 which e'st'ab- V .lishes a locking"clrcuitfor'the relay 287' in-' 6 dependent oflthe circuits of Fig.2;- and individual to the connecting circuit F traced as follows :"from' the ground pole of battery E,, the conductor 283, the now closed contacts 1740f the relay 417, conductor 284, i i

the now made contacts 282v oft-he relay 287, the Winding of therelay-287, and circuit conductor 281-lead1ng to the negatl'ye pole of battery E Current flowing over this Cir c'uit will keep the relay 287energized until the connection is taken down, and the relay 47 de-energized and its contacts 7 4 released. 7 The relay-280 will also close its first pair of contacts 30 'L l1icl1 will establish like locking circuit over the same conductors as the locking circuit for the relay 287,,1arid these two relays will in lilreinanner remain energized for the balance of the connection. The relays'280 and 287-alsoattracted their armatures switching circuits later to be described. V

It will be seen that the particular substation on the line L, calling by the- particular resistance coil 13, 13, 1' or not the substation which has been inserted in' the line circuit, determines the numberof the relays of the groupYZ and therefore the number of therelays287, 286 or 285 which will be operated and the number of the last named group operated, conditions-circuits as will be later described toproperly register the call against the particular calling station. At this stage ofth'e operation of the system, the operator hasbefore her glowing one of the lamps 16, 17. 1.8'or 19/50 indicate which of the parties of the line is calling. Also 1n-V cluded in the connecting circuitfF being;

used, are 'onerateda certain .nuinber of the individualized relays 285, 286, 280 and 287.

Under the assumptions We are making in this description, the relays 287 and 280 are operated to control selective circuits as will be later described. 1

During this period the operator is in conthimble of the jack, and it the line. is

busy battery potential will be found upon the thiinble of this ackand will be carried through a Winding; inductively linked with the operators telephone set over 'a circuit comprising conductorQOG, contacts 20-? o'r' the relay 208, conductorQllQ, contacts 210 of the relay 82,'circuit conductor 211, 3,3 oi Fig. 2-, the Avindingor" the busy test relay 212, and from thence to the ground pole of battery. It the line is busy the flow of current over this circuit in the ordinary Way. will attract the armature of this relay causing current to flow from the ground pole of battery 213. the now closed contacts 2% of the relay 212,conductor 215, the Winding 216 of the induction coil 2175 conductor 218 leading. to the negative pole of batteryE This how of current will be momentarily translated through the circuit comprising the Winding 219 of the induction coil 217 and the operators receiver 220, and cause a click l to be heard by the operator apprising her that" the line is busy. It the line'is busy' the operator will so apprise the subscriber and will Withdraw the plug P from thejaclr J restoring all of the circuits to normal con-i dition.

However, if the line is not busy the opera ator will insert the plu 'P in the jack J of the calleddhr line making connection therewith, and she will furthermore depress the ringing lrey K to ring thecalled tor subscribenrand the. depressal of this lrey Wlll also operate contacts K assisting in the establishing of the ringing condition as will be later described. 1

It the called-for line is a party line, which we \Vlll assume 15 not the case in this description, other of the ringing keys such as K H or K cwill be depressed connecting difi erent ringing, generators as. G G G or G will be connected to the circuit of therline .denending upon which key is depressed. The ringing circuits illustrated are not newand are not claixnedas such in this application being the ordinary harmonic selective party line system associated with a common form of automatic ringing systems. The circuits thereof will be later briefly de scribed- L .Vhen the plug P was inserted into the jack J acircuit Was established local to the exchange as follows ::ro1n the ground pole of battery, conductor 288, the winding ofthe' relay 2S9, conductor 290, conductor 291, the thinible 292 of the jack J the shank 293' of the plug P conductor 29%, the Winding of the relay 82, and conductor 295 leading to the negative pole of battery Iii Current Will flow over this circuit energizing relays, 82 and which will attracttheir area; tures switching circuits later to be described.

The relay 289 is the original out-oil relay of the called line L and its arniatures being attracted will break contacts 296 and 29j7' disconnecting the line relay 298 and its e'ner-' gizing circuit troin'the circuit of the line wires inthe usual manner. Contacts 8ljof the relay 82 will be broken opening the cir. cuit oi the relay 7.), and thereby opening the circuit oit the conductor 6 at the contacts 88; this conductor 6 being whatl have termed the coinn'ion negative battery'supplycon ductor for the local circuits of Fig.2; and these circuits Will there fore'a'll. be restored to norn al. i a Tlhe conductors 2-, 4, 5,6, 7, 8, aim-1 10. u hiclrl ad through contacts 86, 87, 300, 299, 278. 298 and of the relay 79 all being broken these contacts and the circuits controlled over. theseconductors "as shown in i3. 2 will all be restored to normal. v The relays 28]? and 280 previously men: tioned as being operated through contacts 298 and 2780 the relay 7 9 will remain operated over the local locking circuit previously described. Theoneratonhaving depressed the particular selective hey K K K or IQ to ring the Cesired party. for instance, the lr'eyK to ring thewhell ot the substation H onthe line L which is an individual line, the contacts 302 will be closed on the key K and the contacts of the key K will also beino;

incntarily closed/,Th last named contacts. I

being closed a circuitwill be formed 't'ollouse-from the ground. pole .ot battery through the contacts of the key K, circuit conductor 303, the Winding of thei ringi ng" relay 20s, u1e circult conductor 304;, there aerit'orm the rin ing function. The contacts l h will be closed to form a locking circuit to theground pole of battery for the relay 208 independent ot the circuit to ground comp ing the conductor 303 and the momentarily closed contacts K of the ringing hey.

When this is done a path for the ringing thence 'ductor the 331 otthe substation H, line conductor 323, 2

current \villbe completed from the generator G to the bell'ot the calledr"or sub-- soriher at Substation H as follows :tro1n the ground pole of generator, circuitcon through the bell and condenser of the sub" stat-ion H over the line conductors lead rig to the sleeve sprlng of the ack J and from thence to the cooperating sleeve of the plug 32st, the circuit; concircuit. conductor 326; now closed contacts 0t the'relay'20$,circuit conductor 328, the resistance coil 329 circuit conductor 330, and'circuit conductor 4-2 to the negative pole of battery E The bell of the subscriber will continue to ring until the response of the callecl t0r subscriher who responds'by taking his receiver from the hook bridging the line conductors and by his telephone set comprising atransmitter and receiver 331 whereupon the relay 318 will effectively short circuit the Winding of the relay 208 b r means of contacts of the relay 318, and the'relay 208 will release its armatures' and the lock inc circuit for the'relay comprising contacts will be broken: The talking;- strands of the cord circuit will be connected through from the plug P to the plug P the circuit comprising in part the contacts 207 of the relay 208, and the condensers 334 and 3-35,

and the conductors 39 and 40'. Also a oath for the su 'aplying of talking battery to the substation transmitter of the substation H will now be complete traced as follows:

from the gro'undpole of batteryg circuitconduct-or 336 theleft-hand winding of the relay 4-1. circuit conductor 33?, the now closed contacts 338 ofthe relay S2, ci rcuit conductor 339, circuit conductor 209, the normally closed contacts 207 of the re lay 208, the circuit conductor 206 leading to the tip of the plug P the tipspring or" the jac-k J5, line conductor 322. substation transmitter and receiver thesleeve spring of the jack J tae sleeve of the plug P conductor circuit con ductor 3&1, the right-hand winding;- of the relay 44L, circuit conductors330and 42 leadins: to the negative pole 'ofbatteryE The relay H is the supervisory relay, and will now be energized by current flowing over the circuit just traced and will attract its armatures switching circuitsto be described.- Fi'rst thecontactsSOG of the relay a will be broken preventing the operator from 'ring- 1119; on the subscrihers line Whilethe subscriber is on the line, this in the Wellkno\vn will be closed completing a" circuit includmg a particular one of the cominutators c c 0 and 0 used to perform the register selection and register operation functions. Since I assume'th'at t is the substation B'on tio'n andthat by the act of the B subscriber depressing; the button 226' oi 'hls' instrument;

the resistance coil r automatically operated the relays 28Yand 280 of thecord'circuit- V the commutator-c5 Will be eiiective, to per form the above'tunctions; ,The first circuit 1 effected thereby is as tollowsz.trom the battery E the commutator revolves we vi'ill assume that the brush thereof 34:6 comes fil'StllltO contact with the segment 34?, and thereafter the segment 348, and later 349, the insu-:

ducting segment 3 51. v 7 V i i It Will be seen that certain oithe' seg ments, namely, 351, 34] and 34-8 make conla'tinr; [segment 350, and linally' thecontact u it-h the brush 3&6 fora very short pe riod of time, and that the segment 349 is" Way b interru )tin the circuit oi the rela v I. V b V l I 208. i ls-o the contacts of the relays-l the calling line whichinitiated the connec- I circuit conductor" 343, circuit conductor 344, the commutator 0 and-as wider and will therefore 'make contact for v 1 a relatively longer period of time. The insulating segment 350 u'ill'ialso make contact with the brush for a relatively long-pe-' riod of. time. The circuitsare so arranged as will bec clescribed so thatno operative function Will be performed therein during he revolution of the, commutator untilthe vlarge c 0ndactingsegment 34-9 makes contact with the brush 346 and thereafter each otthe segments will 'performan operatim function. the segment 3%? makes quick passing contact with the brush 3&6, the circuit which I have started to describe \Vlll'pfiSS throuch this quick passingcontact and through, the brush 3-16, andover circuit conductor thenormallyniade contacts853 oi the relay 296; the now made contacts 35% otthe relay 286, the non. made contacts otthe relay 287; circuit conductor 356, the noiv made contacts of the ,relay"4l4 circuit conductor 357. the normally closed contacts 358 or the relay 859, circuit conductor 360 through. thevrinding' of the relay 12 over Forinstancegassume now that circuit conductor 361; through contacts 362 i and circuit conductor 83 to the ground rpole'ot battery. Current vflll flow overth s circuit including the winding of the relay 12 and it will attract its quick acting armature 365only and as this armature does not Y perform any operative function so far as f bein made slow actin in an r other suitable manner, will not be attracted by the quick impulse 01' current passed throughthe short contact Set, nor will it be operative by m1- pulse of current passed by the other contact 848, but later when the long contact 3&9 passes current to the brush 34:6 contact will be made for a long. enough, time to fully operate the armature 36-2 to causeit to close contact 365, thus conditioning the relay 359 for operation, but which relay at the present time will notbe operated due to there being a short circuit placed about its winding by the segment 3&9 leading to the negative pole of battery. 7 1

The contacts 365 of the relay 12 will close another circuit howerer for the relay 15 traced as follows :'l"rom the ground pole of battery, he winding of the relay 15, circuit conductor425, the normally made contacts 426' of the relay 359, circuit conductor 368, the now closed contacts 365 of the relay 12 and circuit conductors867, 866, 344: and 343 to the negative pole of battery E Current flowing over this circuit will operate relay l5 attractingits armatures and breaking contacts 62 which will interrupt the flow of battery current tothe subscribers instrument B and through the resistance electromagnet r which has been described as at the time energized maintaining contacts 31 opened, and the supply of current being interrupted by the contact 62, the electromagnet- 1", will be tie-energized restoring the short circuiting contacts 31. to normal operatire condition, and the substation instrument will be connected to the linewires in: stead of through the resistance of the coil 7-,.

l? ow later upon the commutator c advancing to the positionwherein the brush, 346 rests upon the wide insulating segment 350, the relay 359 will be operated over a circuit traced as followsz-from the negative pole of battery E circuit conductors 34.3, 34A, 366, and 367,"the now closed contacts 365 of the relay 12, circuit conductor 368, the winding" of the relay 359, circuit conductor 360, the winding of the relay 12, circuit rconductor 361, now closed contacts 362 of the relay 82, circuit conductor 83, and from thence to the ground pole of-battery. -The relays 359 and 12 will thus be lockcd'in operative circuit and both will maintain their armatures attracted. The circuit of the impulse transmitting wire from commutator c is new extended to the relay 13 by means of now made contacts 369 of the relay 359, circuit conductor 370, normally closed contacts 371, circuit conductor 372, the winding of the relay 18, circuit conductor 561, the now closed contacts 362 of scribers line.

the relay S2, and from thence to the ground poleot battery. The contacts 426 of the relay will now beopened restoring the relayifi to normal position and re energizingthe source of battery supply to the subo'? the relay i3 is the armature 373, and it,

will. respond to the rapid impulses of current from the next passing short contacts 351,"

8 l7nnd 3 18 while the slow acting armature, 3.7% is inoperative. Thus the contacts will be rapidly and intermittently closed three times when the commutator c, is in The quick acting armature circuit with it, and the contacts 375 being thus rapidly closed willcompletea circuit comprising the high voltage direct current generator and electroresponsiye, ap paratus in the circuit ot1the lineas will'be later described. The. circuit is traced as folk lows frorn the Groundpole oi the l -h voltage generator G through the said generator entering by way of the opposite pole and line by way'o't the negativepole thereof, circuit conductor 376, theintermittently closed contacts 3T5 of the relay 13, circuit conductor 37?", the normally closed contacts 378 of the relay 379, circuit conductor 380, the now closed contacts 381 of the supervisory relay-44, circuit conductor 45, and for the rnaj or portion of the. current, the circuit conductor 16, the winding of the relay 4?, circuit conductor 48, circuit conductor 41, the shanke'9 of the answering plug P,, the co-operating thimble 50 of the jack J, of the calling line, the circuitconductor 51, the winding o1 the cut-off relay 11, and circuit conductor 52 to ground. This will cause "a considerably increased current to flow over the circuit including the winding of the cutoff relay 11, and the relay 11 will operate its slow armature 55 once'for each of the short segments fiol, 3- 7 and iatS of the coinrnutator The armaturefio' thus respond ing to the rapid'impulse or" current, contacts 352 will he intermittently and rapidly oper atod'to operate in sequence the relays 383, 384, 335, 886, 387, and 38S, and if thereare enough impulses, 389 and 390. o

The number of impulses, and therefore the number of these rela s o aerated will do J pend upon which one ot the commutators c, ,.c,, 0,, or 0;; is included the impulse sendinst circuit justdescribed.

I will now describe thecircuits involved V in the operation of the relays under the as: sumption that it is the commutator c, which is includcdin the impulse sending circuit; In such a case there will be three rapid impulses of current'followcd by a relatively.

impulses, the relay 383 will be operated over a circuit traced as -follows :from the ground pole of battery, contacts 382, armature 55, the normally closed contacts 391, the circuit conductor the winding of the relay 383, circuit conductor 393, circuit conductors 21 and leading to the negative pole of battery E. The relay 383 will be operated by current over this circuit and will attract its armatures, closing; contacts 394 and 395. The contacts 395 being closed will condition a circuit for the relay 384, which circu t will be operative when the intermittently made contacts 382 are opened which will happenat'ter the first rapid impulse.

The circuit then for the winding of the.

relay 384. can be traced from the ground pole of battery, contacts 56 of the-relay 11, eircuit conductor 396, the contacts 395 of the relay 383, circuit conductor 397, the

. winding of the relay 3S4, circuit conductor tie relay to be operated over-a circuit.

traced as tollowsc Frorn the ground pole of battery, the contacts 382 of the relay 11',

the now made contacts 399 ot'the relay 384, the normally closed cont acts 400 of the relay 386, circuitconductor 401, the winding of the relay 385, circuit conductor 21 and cir-' cuit conductor 20 to the negative pole of battery E. The relay 385 will thus be operated attracting its armatnres and closing contacts 402 and 403. The contact 402being operated will condition a circuit for the relay 386, which relaywill be operated im-. mediately thereafter when the contacts 382 are opened. Current will flow over a circuit traced as follows in-luding the winding 'of the relay 386. From the ground pole ct battery. contacts 56 ot the relay. 11. circuit conductor 396, contacts 402 of the relay 385, circuit conductor 404, the winding of the relay 386, circuit conductor 401, the wind ing of the relay 385, and circuit conductors 21 and 20 to the negative pole of battery E. The relay 386 will thereupon be operated attracting its arina-tures. r I f The first armature breaks contacts/405- in the circuit of the register 'a-and prevents'tlie register a. from operating which it would otherwise do because of the previous closure of the contacts 406 of the relay :The contacts 405 break the circuit however before the slow acting register a canoperate.

The circuitv controlled by the impulse sending contacts 382 is now extended by means of contacts 407 to the relays 387 and r 388. The third closure of the contacts 382 will thereupon operate relay 387 which will 7 attract its arinatures closing contacts 408 and 409, thecontacts408 conditioning the relay 388 for operation, and thecontacts409 0011- ditioning the register I) for operation. The register Z) however will not have'time to operate because the third rapid impulse of current will be followed by an opening'of the controlling contacts 382'which will permit'the heretofore short eircuited relay 388 to immediately o'peratebreaking the contacts 410 in the 'circuito'fthe slow acting register I). The relay 388 being operatedin thesamemanner-as wasythe relay 386 and in the same manneras the relay 384 the operation of which relays has been previously describechwill extend the impulse sending circuit controlled'by the contacts 382 to the next pair of relays 389 and 390; V 'By referring now to the commutator"'0 it will be, seen as hasbeen said, after the contact has been made,'that the three rapid contacts v351, and .348 will be followed by a long contact. This will nowproduce a long operative closure ot the contacts 382 ofthe relay 11-, and will operate the relay 389 for a relatively long'period of time overa' circuit traced as follows:-.from the ground pole of battery, contacts 382 of the relay 11, contacts'399 of the relay" 394, the

contacts 407 of the relay 386, the contacts 411 of the relay 388', the normally made contacts 412 ofthe relay 390,'the windingof J the relay 389, and circuit conductors 21 and 20 to the negative pole of battery. This will operate the relay 389 for a'longer pecontacts 413 being closed will complete a cir the contacts 56 of the relayll, circuit conductor 415, closed contacts 414 of the relay 389, circuit conductor 416, the normally closedrcontacts 417 of the relay 390, circuit conductor 418, the register 0, and circuit conductor 20 to negative pole of battery E.

1052. riod for time than was' the case with the Y rre lays'383, 385 and 387,1and the relay 389 will close its contact-si41'3 and 414; The

This circuit will be closedpforfa long enough period to enable the slowacti ng register 0 to operate,and thisregister will operate ,to register the connectionpagainst the account of tlie'oarticular calling sub- L scriber on the calling, party line;

Fronr the 7 description given it will be' i 7 easily seen how the. operation of the other regi'sters:a,b or (Z on the line would take 7 The co-i'nmut'ator.'0' when the rapid conplace were the commutators 0,, a ,'or..0 brought into operationiby the other substatrons on l3l1l1116 A, C or D. r

CII

tacts thereof were beingmade as has been described, operated rapid acting armature 3723 producing rapid closure of thecontacts 3'75. When the Wide segment 349 makes 350 pass under-the brush 346, and the short circuit about the Windin oi the relay 379 is thereby removed and this relay will operate attracting its armatures for purposes to be later described.

he operating circuit for the relay is as follows :-fl rorn the ground pole of battery E the circuit conductors 343, 344 and 3-66, the nowcloscd contacts 419 of the relay 13, the circuit conductor 420, the Wind ing of the relay 3'79, circuit conductor 421, the WlIlCliDQ' of therelay 13, circuit conductor 361 the noiv closed contacts 362 of the relay 82, and circuit conductor 83to the ground pole of battery;

The contacts 3'71 in'theimpulse sending I circuit from the interrupter brush 846 will now be opened disabling this-interrupter until the operator takes down the C011118C tion. i I

The contacts 7-378 will be broken interrupting the circuit of the high voltage generator G, which as has been described PIQNlOUS to this time is connected in the circuit of the'cut-off relay 11. to intermittently operate thezcontacts 382. Therefore, the contacts 382 will bc opened for the remainder of the connection, and the opening of these contacts Will interrupt the short circuit which has been operative about the winding of the relay 390, and the, relay 390 will be operated interrupting the circuit of the register 0 at contacts 417. Contacts 422 of the relay 379 will be closed to short circuit the resistance coil 423 in the circuit of the relay 47, this being done by placing neg tive battery potential on the.- opposite side of the resistance coil 423 to which negative battery potential has been connected so that a short circuitof'the winding 423 ensues. The circuit by Which this negative battery potential is placed about the Wind ing 423 is traced. as follows :-Fr0-in the ground pole of battery E circuit conductor 424, contacts 422. ofthe relay 279, circuit conductor 3S0 circuit conductor 381 and circuit conductor leading, to the resistance coil 423. T he subscribers are now in time during the connection. It Willfbe seen that when this listening key is operated the extra contacts 502 prov] ded therein will close a circuit to a particular one of the signal lamps (a a and at, as may be at the time in circuit with said contacts. The circuit for the lamp under the condition which We have assumed, namely, that it is the substation B on L 'thatis calling, and therefore that the relays 280 and 28? f the ordcircuit, are operated during" the conversational period, the lamp (1 will thus be] operatively connected to the contacts 502 over a circuit traced as "follows from the ground pole of battery contacts 502 of the key 501, circuit conductor 508, the now a closed contacts 504 of the-relay 287, the now closed contacts 505 of the relay 280, nor mally closed contacts 506 of th relay 286, circui conductor 507 the signal lamp e and circuit conduct-or 343 to] the negative pole or: battery E The signal lamp there fore'whenever the key 501 is depressed will light the lamp corresponding to the substation o-f the'line calling. The group of lamps a a and a, are arranged to be common to a plurality of connecting circuits and made operative when a key of any of the connecting circuits is operated to indicate which of the parties of the party line initiated the call. After the conversation of the subscribers has been finishedthe subscribers will restore their receivers to the hooks lightingv thedisconnected supervisory signal 84 in the usual manner over acircuit from the-ground pole of battery, the lamp 84, the contacts 85 of the now retired-super -visory relay 59, conductor 76, and contacts 73 of the relay 47 to the negative pole of battery E r v The operator will now disconnect the cord.

circuit by WltlltlliWVlIlfI the plugs P, and P from the jacks J, and J, and all of the circuits will be restored to normal, since at the time, the exchange circuits are controlledby the cut-off relay 11, cut-off relay 289, the

third strand relay 4?, and the third strand 1 relay 82. These relays having their circuits opened at the plug and jack switch will be restored to normal; and the circuits under their control Will also be restored to normal.

I have in the above description described,

made from the same Without violating the spirit of the intention, the objects of which are apparent from the foregoing description.

What-I claim is:

1. In a party line telephone system, the combination with a telephone line consisting or a pair of talking conductors, a main station, a plurality of substations on the said line, said talking conductorsextending between the. said main station and the said substations, one of which is a callingsubstation, a plurality'ot connection counting means associated with said line, one for each of said substations, electric selective controlling mechanism at each of the said substa tions, translating mechanism at the said main station normally dis-associated from said telephone lines, but adapted. to be associated with the said telephone. line,1means to cause selective controlling mechanism to control over'the said talking conductors inscries the operation'of said translating mechanism, and said translating mechanisinbeing adapted to selectively'operate the connection counting means identified'with the calling substation. i

2. In a party line telephone system, the combination oi a telephone -line,a plurality o1 substations therefor, a main station, a register for each of the substations at the main station, a plurality of coils of difierent resistances, one for each of the said substations, means to include the resistancecoil of a calling substation incircuit with the line, translating apparatus at the main station to translate to a certainnumber of current impulses the selective values determined by. the resistance of the substation resistance coil included in the line circuit, and circuit connections to cause the said step-by-step current impulses to selectively operate the calling substations register associated with said line circuit.

3. In a telephone system, the combination ot" atele hone line extendin b its. limbs from a plurality of substationsto a main-ex change'an operators connecting circuit at the main exchange, an answering switch 'thcre for adaptedto connect with said telephone line, selective controlling apparatus at each of the substations on the line, selec, tiveapparatus associated with the connectcircuit under the control of'said substa tic-n controlling apparatus, and selectivecall "egistration apparatus associated with. the.

inc circuit adapted to be sel'ectively operatlundcr the control of said connecting-cirt selective apparatus throughjcontacts aid answering switch.

4. In a telephonesystem, the combination with a telephone line extending in twolinibs from plurality of substations to; a central:-

ollic'e, means thereat for making connection with said line, a plurality of connccti'onreg.

isters associated with said line at the central office, a plurality of substations on saidline, each of said connection registers being iden. titied with a particular substation on the line, electrically selective mechanism for as" I 'bringing'said registers into'operative relation with said connection means, and identifying apparatus at the calling station for selectively controlling sald inechanlsm by current variation the number of current variations being the same for all ofthe dilierent stations.

5. The combinationwmh a telephone line extending in two limbs from a plurality of substations to a central oliice,of a resistance at each of the said substations to be in.-

cluded in abridge of the line, and each of.

said resistances being of difl'erent value, a connection register. for each of said substations associated with the line-at the central oiiice, selectively'operated mechanism for operating one of said registers, said mechanism ,being selectively controlled to select; the register of a calling substation by the particular resistance included in the bridge of the line at the calling substation.

6. In a telephone system, the'ooinbination with a plurality of substations, of a telephone line extending in two limbs from the said substations to a main station, a connection switch-at themain station adapted to connectsaidielephone line to a connection ed to be extended in conversational circuitcircuit whereby said telephone line is adaptto a called-forline, identifying means at all of the substations,;all arranged to gencrate the same number of current variations, a register for .each of said substations of the line associated with the line at the main station, a connection switchto extend the connection from said connection circuit toj' the called-for line, substationapparatus on the called-tor line, and means to cause the par ticularregister belonging to the calling substation to operate, the said means being under the control of the connection switch,

the substation apparatus of the called-for.

line, and the saidcalling substation id'entitying means, the said selective co'ntrol befplurality of resistance coils for the 'substa ing exercised over the two limbs of the 7. In a telephone system, the combination tions, oneateach of the substations, said resistance coils being of difi'erent ohmic resistances, and apparatus at themainfstation controlled by the inclusionof one of the reslsta-nce coils in circuit wlth the lineto selecing meters. I

' tively operatea particular one olsaid count 8". In a telephone system, the combination ratus being controllable by the said line resistaice to condition the said translating apparz-it-us for selective operation of the said counting meters, and the said translating apparatus including means under the control ot' a resistance unit included in circuit with the line to cause selectiveoperation of the'proper counting meter identified with the calling substation.

9. In a telephone system, the combination Wit-ha plurality of telephone lines, a plurality of substations for each of the lines, a connecting circuit for the said lines, aplurality of counting meters associated with each of the lines, each one of the said meters correspondin to a particular substation on the line, mechanism at each substation for causing a current variation, all of said mechanisms being arranged to cause the same number of current variations, and apparatus in the connecting circuit controlled over the-talking conductors of a calling telephone line connected in series by the mechanism of a calling substation oi one of the lines to selectivelyjoperate the particular counting meter of the line corresponding to the particular substation of the line calling.

10. In a telephone system, the combination of a plurality of telephoneliucs. a plurality of substations for each of the lines. a plurality of conneoting'circuits for; the said lines, a plurality of counting mcters associated with each of the lines, each of the said meters corresponding to a particular substation on its line, and apparatus common to a plurality of connecting circuits controlled by apparatus of a calling substation of one of the lines to selectively control the operation of the particular counting meter of the line corresponding to the particular substation of the line calling.

-11. In a telephone system, the combination with a telephone line extending by its limbs from a plurality of substations-t0 a main station, a plurality of electro-responsive call registration devices associated with the line at the main station, a plurality of resistance coils for the substa ions, one at each of the substations, the said resistance coils being of different ohmic resistances, and apparatus at the main station controlled by the inclusion of one or the resistance coils in circuit with the line to selectively operate a correspending one of said electro-responsive devices. I I 12. In a telephone system, the combination With a telephone line, a plurality'of substa-V tions for said line, a counting meter for the line at the main station, an electro-magnet at the substations, said electromagnet being of suitable ohmic resistance, apparatus at the main station controlled bythe inclusion of the electroma net in circuit with the line to operate the said counting meter, it called substation, and releasing means at the main station for the said electromagnet zwhereby the electrom agnet is dis-associatedtrom operative connection of the line upon. the rer sponse of said called station apparatus.

13. In a telephone system the combination with a calling and called telephone line, a plurality of substations for each of the lines, a connecting circuit for the lines, a plurality of counting meters associated withcach of the lines, each one of the said meters'corre spending 'toja particular substation on the line, apparatus in the connecting circuit controlled by the operation of a calling sub-1 vith each of the lines for each substation thereof, a plurality of link circuits for interconnecting the lines, electromagnetic means for preparing the meter corres iionding to a calling substation on aline for ,operation, means ope-rated responsive to a con nection between one of the said link circuits and acalling line to associatethe said electromagnetic means with the said link circuit, selective controlling means ateach of the substations adapted to control the operation of the said electromagnetic means over the two limbs of said telephonelines in series, allot said selective controlling means-at all of said substations being operated to produce the same number of'current variations, and. means thereafter operated responsive to'the operation of the saidelec tromagnetic means for operating the said meter circuit to actuate aselected meter.

15. In a telephoneoexchange' system, the combination With aplurality of multi-part'y metallic circuit lines, a meter for each party of the line,an operating" circuit for the said meters, variably operated electromagnetic' means responsive to different impedance values produced in the saidmetallic telephone line for selectingthe meter or" a flu calling party, means at each station of the said line for producing a given different impedance value in said line, said variably operated electromagnetic means being controlled by the said substation means over the .two limbs of the metallic telephone line in series.

16. In a telephone exchange system, the combination with a plurality of party; lines, a meter for each party of a line, a circuit for operating the meters, a link circuit for interconnecting the telephone lines, a man ual connection switch for making connection between a calling one of the said lines and the said link circuit, the said meter operating circuit including co-operating contacts of the said connection switch, electromagnetic means controlled over two limbs of a telephone line in series adapted to be actuated subsequent to the initiation-of a call by electrical means at the substation of any of the parties on the line for preparing the corresponding meter for operation, and

means for thereafter closing the said meter circuit to actuate the selected meter.

17. In a telephone exchange system, the

combination with a plurality of party lines,

a meter for each party of a line, a circuit for operating the meters, a link circuit for interconnecting the telephone lines, a connection switch for making connection be tween a calling one of the said lines and the said link circuit, the said meter operating circuit including co-operative contacts of the said connection switch, subscriber con trolled mechanism at each substation for producing a current variation, said mechanisms being all operated to produce the same number of current variations, electromagnetic means controlled over the two limbs of the telephone line in series adapted to be actuated subsequent to the initiation of a call by the mechanism of any one of the parties on the line for preparing the corresponding meter for operation, and means for thereafter closing the said meter circuit to actuate the selected meter under the control of a called subscribers substation apparatus.

time interval. 7 J 21. In a telephone system, a plurality of tus at each of the said substations, saidsubstation apparatus and the conductors of the said line containing a certain amountot ohmic resistance, a balancing relay at the main station adapted to beiconnectedv to the said line, electrically controlled rheostat mechanism .at the main station adapted to be variablyoperated under the control of the said balancing relay and the apparatus of a calling substation, a line resistance, an additional resistance adapted to be inserted in circuit with a calling substation,- means to cause the said electrically controlled rheo stat mechanism to be again operatedto indlcate the valueot the ohmic resistance of the mserted resistance, a meter for. each substation of the line located at the main sta tion, means responsive to thead ancedposition of the said rheostat 'mechanism to" meter, a circuit therefor, a meter controlling I relay, means for operating said meter controlling relay to close one point of said circult, and auxiliary, controlling means for delaying the operation of said meter by.

holding said circuit open at another point.

20. In a telephone system, a meter, a circuit therefor, a meter controlling relay, means for operating saidmeter controlling relay to close said circuit atone point, and

a slowacting relay for delaying the com plete closure otsaid circuit for a certain lines, aservice recorder for each line, an-

other line, means for connecting any of said lines'with said other line, a circuit for said. recorder having two points of control,

means/associated with said other line and controlled thereover for closing both of said points, and automatic means -for delayingthe closure of one of said points until some time after the first point is closed to delay the operation of said recorder.

In Witness whereof, I hereunto subscribe my name this 9th'day of June, A. D. 1917.

FRANK M. sLoUeH;

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