US1532217A - Telephone system - Google Patents

Description

April 7, 1925.

TELEPHONE SYSTEM Filed Sept. 12, 1921 2Sheets-$heet l fir Q lrl aflwmmh e. A. YANQCHOWSKI Patented Apr. 7, 1925.

GEORGE A. YANOCHOWSKI, 0F CHICAGO,

TELEPHONE Application filed September To ((Z/ whom it may co-ucem:

Be it known that I, Gnome A. YANG- oiroivs r, a citizen 01" the United States o'i America, residing at Chicago, in the county of Cook and State of Illinois, have inventor. certain new and useful Improvements in Telephone Systems, of which the following; is a specification.

My invention relates to telephone systems, and has to do more particularly with divided switchboard systems in which primary and secondary operators are provided for ii'iterconnecting calling and called subscribers lines.

in object of my invention is the provision. of an improved and simplified divided sw tchboard system operating in connection with a circuit arrangement provided with multiple line lamp distribution, automatic rii'iging' and listening, instantaneous discon ncct and recall and secret service.

Another object ofmy invention is to manually distribute the calls, by means of primary operators, to idle secondary operators. 'lhe call \vhen'initiated is made to appear he'tore a plurality of primary operators positions by means of the Well l-znziiwn nuiltiple jack line lamp distribution systen'l', which gives a plurality of primary operators access to each incoming call.

A feature of my invention is the provision on improved system in which the excl ang e switchboard is divided into primary M" d secondary sections, or separate primary ind secondary boards are provided. The

.(i into operators positions which are sag .e section or the switohhomd at which the secondary operniary section oi the switchboard is di- THEN OE ILLZL J'QIS, T!) SV'FTCH: BOARD AND SUPPLY COMPANY, OF CHICAGG,

ZLLXNDES, it CGREGEA SYSTEIV'I.

12, 1921. Serial No. 4:99,990.

a )is are located is divided into positions; said positions are provided with calling; plugs and multiple jael-Is only as is vrell understood in the art. The answering plugs of the primary operators positions lead and are distributed among the different second ary operators, and when a cell appears herore a number of primary operators, the tirst operator to seize the cell merely uses an answering plug Which extends to idle secondary operator and plugs into an air sivering jack of the calling line, thereby extending the connection to an idle secondary operator.

Another feature oi. my invention is the provision of the lousy signaling means whereby when a secondary operator at a secondary position is completing a connection to a called line, all the circuits extending to this particular secondary operatords position from the primary positions ordesignated busy to the primary operator by means of suitable visual signaling means.

Another feature of my invention is the n'ovision of distinctive indicating means to the primary operator, should she answer a call subsequent to the first operator seizing the call; this distinctive indicating means being; in the form ot a flashing signal so as to notify the primary operator that the call. has already been answered by another primary operator, and I al o provide suitable means to prevent the attempted connections to he extended to a secondary operator to which this primary cord leads. That is, I provide means so that when a primary operator connects to a callino' line, which line has alrea been seized by another primary operator, the call is not extended to a secondary operator.

Anotherfeature or my invention is the provision of indicating means for the sec ondary operator, to whom the call was 0;- tended by a primary operator, to notify the said secondary operator tha ans i t, as Well others, will fully described he ensuing speoi ill For a better understanding of my invention, reference may be had to the accompanying drawings, in which Fig. 1 illustrates the preferred circuit arrangement embodying my invention; and

Fig. 2 illustrates diagrammatically one method of extending the cords from the primary operators positions to the secondary operators positions.

Referring now more particularly to the circuit arrangement of Fig. 1, I show a calling substation A terminating at the exchange in a line circuit L, which comprises the usual line relay LR, cut-off relay CO, line signals S and multiple answering jacks AJ. The answering multiple jacks AJ and line signals S appear before different primary operators positions, and upon initiation of a call, the multiple line signals are lighted and any one of the operators before whom these signals appear may answer the call. The switchboard is divided into two sections, a primary section and a secondary section. The primary section contains a number of operators positions and each primary operator has appearing before her a number of these multiple answering jacks. The positions of the primary section are equipped with answering plugs only and answering supervisory signals, and the connecting circuit C, as illustrated in rig. 1, comprises a primary operators cord PC, which comprises an answering plug AP which is inserted into the answering jack Ad to connect to a calling line. A high resistance test relay TE is provided which is energized when the answering plug AP is inserted into the answering jack AJ of the calling line. The said relay TE upon energization closes a circuit for the answering supervisory relay AS. The high resistance test relay TE and the answering sleeve supervisory relay AS are for permitting only one operator to seize a call, as will be more fully described in the ensuing specification.

An answering tip supervisory relay AT is provided for the usual supervisory purposes, and controls the lighting of the answering supervisory lamp AL. The primary operators cord PC leads to a secondary operators cord circuit SC by means of the conductors a, b, and the secondary section of the exchange switchboard is equipped with calling plugs only and contains a number of secondary operators positions, each of which have multiple jacks J so that a call extended to a second operators position may be extended to the called line through the agency of the calling plug C? of the secondary operators cord and the multiple jacks J. The secondary operators cord SC comprises a calling plug GP for connecting to a called line, and a calling sleeve supervisory relay CS Which is energized upon the insertion of a calling plug CT into the multiple jack of a called line. calling tip supervisory relay CT is also provided which is energized upon the response of the called subscriber and is for the usual supervisory purposes for controlling the calling supervisory lamp CL.

An operators listening relay GR is also provided which when energized connects the secondary operators set 0 to the cord conductors so that she can converse with the calling subscriber. A party-line ring n key BK is provided which controls the connection of ringing generators G, G, (l and i and in association with the ringing hey BK I provide a ringing control relay Pai which controls the application of rin 'inc. current to the called line, and in associ on therewith T also provide an interrupter relay IR which is intermittently energized and tie-energized through the agency of the constantly rotating interrupter I for intermittently connecting ringing current of the proper generator frequency to the call bell of the called line. A calling line lamp C51 is also provided which when lighted signals the secondary operator that a call is awaiting her attention. A group relay GB common to a secondary operators position also provided for purposes as will be more fully hereinafter described.

Each circuit C at any one particular secondary operatofs position is provided with a non-interfering relay These relays have a chain engagement to prevent connecting the operators set to more than one cord at a time. The group relay GB when operated lights the position busy lamps BL at each primary operators position that has circuits extending to one particular second ary operator. If through inadvcrtence more than one call is extended to a busy secondary operator, the relays OR operate to connect the secondary o1 erators head set to the calls one at a time as the connections are completed.

To the right of the drawin Fig. l, I show :1 called substation l3 tcrn'iinating at the exchange in a line circuit L, comprising the usual line relay LR, cut-off relay (.Q, line signals S and multiple jacks J. I

Fig. 2 illustrates diagramn atically one method which may be employed in d' tributing the primary cords from the pr nary operators positions to the secondary operators positions, but it is to be understood, however, that other methods of distribution may be used.

In the drawing I illustrate two priman'y operators positions PO and Pt), each having a plurality of answering plugs for use in answering calls from subsc iliers lines which terminate at their positions. The secondary operators positions SO, 5). SU St) and 30* are provided with en plugs GP for use in extending calls to cede: subscribers lines which terminate in multiple jacks J7 at each. or the secondary operators" positions. The prnnary operators positions P are provided with a number or answering plugs AP which I divide into ive groups 0, (Z, c, f and g, and as herein shown, the first group of plugs AP from the primary operators positions P) lead to the secondary operators positions SO and terminate in the calling plug CP. The second group (Z leads to the secondary operators position SO, the third group 6 leads to the secondary operators position S0 the fourth group leads to the secondary operators position i. O, and the fifth group 7 leads to the secondary operators position S9 The primary operators position PO is also provided With answering plugs AP divided into similar groups 0, d, e, f, and g, and lead, respectively, to the secondary operators positions S0, S9, S0 30'' and 30*. The secondary (n crators position is provided with a group relay GR which is energized at the time that the secondary operator is extending a connection to a called line to light a busy signal lainp BL at each prin'iary operations position that has access to this particular secondary operator, so that none of these operators will extend :alls to this secondary operator While she is extending a connection to a called line.

From the above description it may be readily seen that the calls ill be thus evenly distributed among; the diii'erent secondary operators. The primary ope 'ators distribute the calls manually to the (littercnt secondary operators. The line lamp distribution makes all calls accessible to each priniary operat r, thereby permitting any primary opers or to answer any call and extend the connection to any idle secondary operator that she has access to. This makes it possible for one primary operator to answer all calls at night Without moving from her position.

Having: described in general the apt ara tus embodying my invention, I will noiv de-,

scribe in detail the operation of the circuit as illustrated in Fig. 1.

Assuming now that the subscriber at the falling substation A initiates a call, the removal of the receiver thereat establishes an energizing; circuit for the line relay LR. ot the line ci cuit L. The line relay LR upon energization closes its alternate contact to light the multiple line signals 8 to signal the primary operatorsbetore Whom. the inswering jacks A5 are positioned, and one of the primary operators seizes the call by inserting an answering plug AP leading to an idle secondary operators position into the answering jack AJ. The insertion of he plug; AP into the jack Ail closes an energizing circuit for the high resistance test relay TE of the primary cord PC and the cut-off relay C0 of the line circuit L,

nectec plug All and jack Ad to ground through the winding of the cut-oil relay C0. The-relay AS upon energization closes its alternate contact 5 establishin a substitute energizing circuit for the relay AS, independent of the alternate contact oi.

the test relay TE, this substitute circuit being traced from battery through -tl1B-Wl1'i(l mg 0-; the relay AS, its alternate Contact 1 5, cond ctor z, normal contact 3 of the relay Ll), the sleeve contacts of the connected plu a? and jack All to ground through the winding of the cut-oil relay CO. The relay C0 is also energized to open the circuit of the line relay LR and the line re-. lay LR tie-energizing brings about the eli'acement of the multiple line signalss. The

apswering tip supervisory relay AT is also. energized over a circuit traced from battery through the upper winding 01 relay AT, normal contact atlot relay Ll), tip contacts of the connected plug AP and jack All, i

through the substation, baclr through the ring contacts of the connected plug AP and jack All, normal contact of relay LD to ground through the lower winding of relay AT; and the energization of the relay AT prevents the premature lighting of the answering supervisory lamp. AL. The relay AS upon energization closes its alternate contact 6, establishing an energizing.

circuit for the operators listening relay OR of the secondary cord'tlC ot' the idle secondary operators position, traced from battery through alternate contact 6 of the re lay AS, conductor 7, normal contact 8 out the ca ling sleeve relay CS of the secondary cord SC, conductor 9, the winding 10 of the operators listening relay OR, conductor ll, through the series contacts 12 ot' the chain or relays OR of the secondary open ators position, conductor 13-3, normal contact 12 of the relay OR, conductor 14, to ground at normal contact 15 of the group relay GR, which relay GR is common to the secondary operators position to which the call has been extended by the primary operator. T he relay OR energizes over this circuit and upon energization opens its normal contact 12, opening the initial energizing circuit 01": the relay QR, but a substitute circuit is established for the said relay Which lit) lift) may now be traced from battery through the lower winding 16 of the relay OR, alternate contact 17 of the relay OR, conductor 18, to ground at normal contact 19 of the calling sleeve supervisory relay CS. The closing of alternate contacts 20 and 21 of the relay OR connects the secondary operators set 0 to the cord conductors, and the closing of alternate contact 22 closes an energizing c"cuit for the call indicating lamp CA, raced from battery through alternate contact 22 to ground, through the lamp CA. The lamp CA. is lighted and indicates to the secondary operator that a call has been extended to her position and also indicates to her that her operators set has been con -ceted to the cord conductors and she now ii quires the wants of the calling subscriber at the substation A.

The closing of alternate contact 22 also closes an energiz'ug circuit for the group relay GR, traced from battery through alternate contact 22, conductors and El to ground through the winding of re ay GR. The group relay Git is common to the secondary oaerators position of which the cord circuit is one, and energizes when a call is extended to the secondary position, and the closing of alter rate contact. of the gro'up relay Git upon its energiraation establishes an energizing circuit for the primary operators group busyine" relay Gil of the primary operators position that OX- tended the call to this secondary operator traced from ground through alternate contact 15 of relay Git, conductor 26, through the winding of the relay GB to battery. lilac-h primary o1 erators position is proided with a number of primary operators" group busying relays Gil, which are common to the cords at the primary operators positions that have circuits that lea d to the secondary operators position. Each primary operators position is provided with a group relay GB, which group relay GB is common to all of the primary cords PC that extend to this secondary operators position to which a call has been ,XtODtlGCl by the primary operator. The relay Gil upon energization closes its alternate conact 27 and establishes a circuit for the busy lamp Bil from battery through alternate contact 27, through the lamp BL to ground. The busy lamps BL at the other primary operators positions are also lighted, thus advising the primary operators of the busy condition of the secondary opcrators posi tion, and this busy condition remains until the secondary operator has extended the connection the called line.

(he operators haying been connected to the cord conductors as above described, she now inquires the 'ants of the calling subscriber at substation A. Assuming that it is the called subscriber at substation l3 that is wanted, the operator tests the multiple jack J appearing at her position to its idle or busy condition, and if the line is busy she will receive the customary has click. Assuming that the line is idle she inserts the calling plug GP into the n'iultiple jack J oi the called line, and this act clo a series energizing circuit for the calling sleeve supervisory relay CS and the ciiit-oli' relay Ct) of the line circuit L of the called substation B, the circuit being traced from battery through the winding of the relay CS, conductor 28, the sleeve cont. cts of the connected plug JP and jack J to ground the cut-off relay CO. The calling sleeve relay CS upon energization opens its normal contact 19, opening the energizing circuit of the operators listening relay ()lt through its holding winding 16, and the relay OR now tie-energizes and the opening of its alternate contacts and 21 disconnects the operators set 0 from the cord conductors. The opening of alternate (501% tact o'l" relay OR also ell-aces the call indicating signal CA and the opening of alternate contact 22 opens the energizing circ'uit of the group relay GP. The group relay Git is now de-energ'ized and the opening oi its alternate contact 15 opens the en ergizing circuit of the group relays GB. The group relays Gil tie-energizing open their alternate contacts to ell-ace the busy indicating lamps BL, notifying the primary operators that the secondary operator has extended the call to the called line and is now ayailable so that other connections may be extended to her position. The closing of alternate contact 19 of relay US also closes an energizing circuit for the supervisory lamp CL from battery through the lamp Cl), normal contact 36 of relay 'l. conductors and to ground at alternate contact of relay CS, the said lamp remainlighted until the called subscriber answcrs.

The secondary operator now depresses the proper ringing key plunger of the ringing key BK to impress the proper ringing generator current over the called line to ring the call bell atthe called substation ii. The depression of the ringing key plunger associated with the selected generator 'liequeney momentarily operates the end springs of the ringing key. T he closing ol alternate contact ot the end springs establishes an energizing circuit for the ringing control relay RC traced from battery through the winding of the relay RU, conductor 31, alternate contact 30 of the end springs, conductors 32 and 33, to ground at alternate contact 19 of the relay CS. The relay RC upon energization closes its alternate contact 3% establishing a locking circuit for itself traced from battery through the winding of the relay RC, alternate com tact 34;, conductor 35, normal contact 36 of the calling tip supervisory relay CT, conductors 32 and 33! to groinid at alternate contact 1:) of the relay CS. The closing of alternate contact 3'? of the relay RC est-ablishes an energizing circuit for the interrupter relay TR, traced from battery through the interrupter 1, through the winding of the relay 1R, conductor 38, alternate contact 3'? of the relay RC, conductor 39, normal contact of the end springs, conductor 32 and 3 3 ground at alternate contact 19, oi the relay CS. The relay TB is intermittently energized and cle energized over the circuit as just traced, to intermittently connect ringing current o cr the called line, the ringing circuit being traced from the ungrounded pole of the generator (it, which We Will assume is the selected generator "frequcncy, the closed contact of the ringing hey plunger over the rin ing conductor il), al ternate contact 4:1, of the! relay IR, the tip contacts of: the connected plug l and jacl: 5, through the condenser and call bell of th called substation B back through the ring contacts c cl at alternate contact 412 of the I ie called SlllLZCllllQl' at the subin response to his call signal removes his receiver from the switch hook and git rd positions, an energizing circuit is establislicd tor the calling tip supervisory relay CT, 1 upper winding of the relay CT, alternate contact of the relay CS, normal contact ll of the relay IR, tip contacts or the oonnccted plug GP and jack J, the now closed contacts of the substation switch hook of substation B, back through the ring contacts of the connected jack J and plug P, nornnw coi'itact 452 of relay IE, to ground through the lower winding Off the relay UT The rela T upon energization opens its act which opens the locking or the rin 'ing control relay RC, and aging control relay RC is (ls-energized and the opening oi its alternate contact 37 the enci-"izing circuit of the relay TR,

the rehiy remain at normal prerents trurther application or ringing current o the called llnc. The opening 0t normal contact 36 ot' the relay GT also opens the cirsupervisory lanip CL and the subscricers at tie tat1onl3 have finreplace th ir the connected jack J of the plug 1CD the relay IR is in one of its de-enertraced from battery through the visory lainp CL is efi acecl and notifies over the heavily receivers upon the respective SWltOllllOOliS.

the answering tip supervisory relay AT, and the closing of its norn'ial contact 46 establishes an energizing circuit for the link tlisconnect relay Ll), traced from battery, through the'winclingot the relay LD, conductor T7, normal contact 46 01 the relay AT, concluctor lfi, alternate contact 49 of the relay AS, conductor 50 to alternate con tact 19" of the relay CS. The link disconnect relay upon energization opens its .norinal contact3, opening the initial energizing circuit of the answering sleeve supervisory relay AS, but a substitute energizing'cin cuit is closed for the said relay traced from battery through the Winding of the'relay AS, alternate contact 5 of the relay AS, conductor 2, alternate contact 3, oil" the relay LD, conductor 51, alternate contact all of the relay AS, conductor 50, to ground at al ternate contact 19 otthe relay CS.

The closing of normal contact 5201? relay AT closes an energizing circuit for the answering supervisory lanip AL, :troin battery through the lamp Abnormal contact of the relay AT, conductors 53 and 47, normal contact 46 of'relay AT, conductor as, alternate contact 49 of therelay'AS, conductor 50 to grounclat alternate contact 19 of the relay CS. The lighting of the answering supervisory lainp AL over this circuit notifies'the primary operator that the calling subscriber at substation A has replaced his rcceiyer. The closing of alternate contactbtof the relay LD establishes an energizingcircuit for the high resistance relay 55, traced from battery through *the line, and the'opening of normal contact 0 Orr-1193mm relay-LDperniits the deenergization of the cutoft relayCQthus placing the line circuit'L otthe-cal'ling subscriber A'at' normal so that should the subscriber Wislrto recall he may 'do so even though the answering plug AP remains in the pol; AJ. The relay 55-energ'izes to ground through the cut ofi" relay CO of the now restored line c-ircuitL, but clue to the high resistanceot the relay 55, the out oft relay CO reinains at'nornial anddoes not make the jacks 'JOf the callingline test busy.

The called subscriber at the substation 3 replacing his receiver upon the svvitclr hook opens the energizing circuit of the calling tip supervisory relay CT. The said relay restoring; to normal again closes its normal contact 36 closing the energizing circuit for the calling SllPGl'VlSOly lamp CL to ground at alternate contact 19 of relay (TS. The supervisory lamp All of the pri: inary o erators position is now lighted, and tl e calling supervisory lamp CL the secondary operators position is lighted, llll ll," eating to the tvvo oierators that the conversation has terminated, and that the subscribers at the calline snhstatio A and the called substation B have replaced their receivers. The primary operator now withdraws the answering plug AP from the jack All openin the energizino; circuit of relay Relay 55 d -energizine closes contact 6L thus causina' the lamp AN to glow at the secondary operators position. The secondary operator now Withdraws plug UP from jack J, and the Withdrawal of the calling 7 Cl? from the multiple jack J of the called line by the secondary operator opens the series energizing circuit of the calling sleeve relay of the cut off relay CG.

is The sleeve relay CS (lo-energizing opens its alternate contacts 19 and 19. The opening of: alternate contact 19 etl'accs the supervisory signal CL the opening of alternate contact 19' opens the holding circuits of the linl: disconnect relay Ll) and the answering supervisory relay AS. The appara us used in establishing the connection between the substation A and the substation ll is now at normal and available for use in est "dishing other connections.

Assuming that conversation has terminated and the subscribers A and B have replaced their receivers upon their respective svvitchhooks as above described. and before the plugs AP and GP have been re moved from their respecti e jacks, that the subscriber at the calling substation A Wishes to recall, the removal oil? the receiver at the recalling substation it closes a circuit for the linerelay LB, and the line relay LR energizing; closes a circuit for the multiple line s gnals S, and the same primary operator may answer the recall, or another primary operator may seize it to the exclusion of the other primary oper tors.

iissinningthat the same nrimary operator seizes the recall that originally established the connection for the calling;' subscriber A, she now Withdraws the answering plug AP from the connected jack T and this ivith- 1/ the drawal allows the relay 55 to restore and the restoration of the said relay closes a circuit through the disconnect lamp AN oi the secondary operators cord circuit SC that established the connection to the called line, the circuit being traced from battery through the lamp AN, conductor 60, normal contact 61, of the relay 5? conductor T, normal contact 416 of the relay ji conductor 48, alternate contact or the relay AS, conductor 50 to ground at altcrnab lie contact 19 of the sleeve relay i lighting of the disconnectlamp All notii" the secondary operator tha' the prin'iar r onerator has Withdrawn the zuasiverin3- plug Al from the jack Ad of the calling line as previously described. The primary operator 110W inserts an ansi'vcring nlu; into the jack All and the connection is ca ended as before mentioned.

Should the calling sul'iscriber at the Sllllstation A initiate a call, the removal oi the QCCIVQI at the substation brings about the liehting; of the line signals S as prerioruily described, and assuming that the call is answered by the primary operator vxho handled the call originally, nov. should another 1')1'l]lltl:y' operator of a primary cord PC insert an answering plug into the multiple answering jack oi the calling line after the call has been seized by the first operato the insertion of the plu l? ot the second Pl'lil' y cord PC brings about the one tion of the answering tip supervisory ix. .atl of this second primary cord, and t, closing of alternate contact 52 oi the rela supervisory lamp fill traced from b2: tl'u'oue'h the said lamp, alternate c nla conductor 70, normal contact 71 o l, '3 v. 4 .3; LR) rotating ll interrupter I. the interruliiter l causes the up supervisory lamp All ot the sci-,-

sn'erit ond primary cord to flash indicatii'ig to priinarv operator of the secon l prii cord l C that the call has been seized l another primary operator. The secon a op. tor is not coni'iected to the callini'" 1.

over the second primary cord PC that he? been inserted into the calling; line as the test relay 'llll oi? the second cord energize, due to the low resistance in ot the relav All of the first primary co a d the relay TE 01 the second prinia cord in shunted and in failing; to 01192 circuit is established for the ans sleeve supervisory relay AS of the primary cord and said relay I: 1% oi" the second primary cord remains at normal and as its alternate contact 6 is not closem tinoperatoi"s listening relay OR of the seiondary cord 90 is not operated and e1 "ors set U of the secondarv cor-z.

is not connected. i

The relay energizes upon the resta rtion o'li' the switch hook at the cali' station and when the relay Ll) one held up to ground through the ca. lay CO, and should a calling tation A. ntiat-e a recall and other operator seize the recall, the relay bscri secondary cord PC and" SC respectively are lighted.

The primary operator in response to the signal AL withdraws. the. plug Al fronr the. jack 'AJ and brings about the lighting of the disconnect lanip AN at the secondaryoperators position giving her a visual indication that the'answering plug has been withdrawn, and the additional lighting of the supervisory signal CL notifies her that disconnection has taken place at-the primary end, andthat the called subscriber has replaced his receiver and that the plug 01. niaynow be withdrawn.

The initial energizing circuits of the oporators listening relays OR of a secondary operators position. extends through a chain relay arrangement in which the-energizing circuits through the windings 10 of the operator s relays are carried through a series connection through the normally closed contacts i2, 152, etc, cit-the operator s relay .ll-l. New should two prin'iary operators happen to extend connections to one secondary opcuxatcr the same time, the relay OR of the secondary cord to which one of the primary operators has extended. the connection from a primary cord of her position operates'over a circuit as previously described, through the chain'relay arrange uient'inchiding contacts 12, 12,-etc., oi other relays OR. Upon the energization or re lay OR its contact 12' is opened and should a second. primary operator extend a'conuection to the same. secondary operator at the same time as the first, the operators relay UR oi this second selected secondary cord will fail. tooperate as the series chain connection through contacts 12,12, etc, is broken at the contact 12" of the relay OR of the first cord, and thus relay Oliot this second cord will not "energize due to the break in the series contact connection and the operator set will not be connected, and it will thus be seen that only one call'can be extended to a secondary'operator at the same time. Relay GR energizing also opens the original energizing circuits for relays OR. If several calls are extendedto one secondary operatorsposition they'will be automatically connected to the secondary opcrators set one at a time as she completes the connections. The. call lamps are not lighted until tliecorresponding relay OR is energized. I

While I have illustrated my invention operating inconneetion with a specific circuit arrangement,it'is"tobe understood that board divided into positions, a

my invention is adaptable to othe systems and that changes and modifications will readily suggest tl'i'einselves to those skilled in the art, and. I therefore aim to cover all such changes and modifications as conic withinthe spirit and scope of the appended claims.

Having described my irwention what I claim as new and desire to secure-by Letters Patent l. A telephone system including a switchboard'divided into'positions, a calling line appearing in multiple answering terminals at a plurality of: said positions, a second switchboard divided into positions, circuits extending tronione of said positions upon said first board to. positions upon said'second board, the answering ends of said circuits being located at said first switchboard,

and the calling ends of said circuits being located at said second switchboard, an operators head set at one position upon said sccond'board, means responsive to the direct connection ot one of said circuits with any one of the multiple answering terminals of said calling line to connect said operators set to said circuit, and subscriber controlled means for disconnecting his line from said circuit.

2. A telephone system including aswitchcalling lino appearing in multiple answering terminals a plurality of saidpositions, a second switchboard divided into positions, a called line appearing in multiple aclitsonsei'eral ct said last 'POSltlOll-S, circuits extending;

'iioni or" said POSliJlODS upon said first board to posi.,ion.s upon said second board, the answering ends ot said cu" 4-1 l rim 126111 ti located at said first switchboarc, an.d."the

' callin ends said circuits beinc' located at b x: J

said second switcl'iboard, an operators at one position otsa d second switchboard,

means responsive to the direct connection oi? one of said circuits with anyone oi? said multiple answering terminals oi said calling line to connect said operator s set thereto,

means responsive to the connection of said circuit to said called line to disconnect said operatofis set from said circuit, and subscriber controlled means for automatically disconnecting his line from said circuit.

3. A. telephone, system including a switch board divided into positions,-a calling line appearing inanswering jacks at a plurality of said positions, a second switchboard divided into positions, circuit-s extending: from one of said positionsupon said first board to positions upon said second board, the

answering ends of said circuits being located at said first switchboard and the calling ends of said circuits being located at said second switchboard answering ternnnals for said circuits at said first switchboardadapted to make physical connection with said sivitchcalling line a plurality 1 1. nooard ciing terminals for sa'd circuits at said first switchboard adapted to make 'li physical connection with said ansu'eri U jaciis,

nnecting said answermanual means for co ing terminals to said answering jacks Whereby calls are manually distributed to the operators at the second of said S\ .l '"llbOtIl(lf an operators telephone set at its second sritchboard, means for automa-ically connecting said operators to c 1010 to one of said circuits when its an or lg terminal is connected to one of suit answering jacks to connect said onerators at said second circuit with switchboard in conversati the calling line, means for operators at said first snvrcl'iboaro when the operators are idle at said second switchboard, and subscriber controlled means for disconnecting the subscribei"s line from said circuit.

A telephone system including a s vitchboard divided into positions, a calling line appearing in answering jacks at a plural it-y oi said positions, a second switchboard di ided into positions, a called line appearing in multiple jacks on several of said last positions, ircuits ex ending" from one o't said positions upon said first card to positions upon said second board, answering terminals for aid circuits at said first switchboard adapted to make dir-ct ihysical connection with said answering jacks, manual means for connecting said answering terminals to said answering jacks whereby calls are manually distributed to the operators at the second oi said switchboards, an operatn"s to ephone set at said seconc switchboard, means r automatically connecting said operators to one of said circuits when its a-nsu 'eri to animal is connected to one of said ansn'erii jacks to cor nect said operators set at said second switchboard in conversa "cu t with tienal c' the calling line, means tcr indicating to the switchboard operators at said first when operators are idle at said second switchboard, calling terminals for said circuits db said second switchboard, manual means for connecting said calling terminals to said multiple jacks to complete connections, and subscriber controlled means for automatically freeing a subscribers line from one of said circuits.

6. A telephone system incluoinr; a sn'i' board divided into positimis, 1

appearing in ansn 'ing terminals ng u'lieth r or not ;he operators at said SQ!- ond sritcl iboard are busy or idle, an op said circuits at said second for automaticall, conanswering end of said circuit one of d answering term Jcriber controlled means tor t re subscribefis line from one ie to b.

u; ph'ine system including a switchboard divided into posicioi s, a calling line appearing in answering terminals at a plurality of said positions, a second sivitchlmard divided into positions, multiple jacks a said second s ritchboard, circuits extending from. one of said posit-ions upon said first board to positions upon said second board, manual means for directly and ph -Jsicall'v connecting: one of said ircuits to said calling; line, an operators set at one position of said second switchboard, iutomatic means at said position for connecting and disconnecting the opcratofis set from the circuits that terminalje thereat when he circuits are counectml to said answering terminals and saic inultijacks resgectivcly, autoiratic means for pr venting th connection of said operators set to more than one circuit at said position at one time, and subscriber controlled means to autoi'naticall freeing a subscril's ers line from one of said circuits.

8. A telephone system including a board divided into positions, a calling appearing' in answering terminals at rality of said positions, a second FEW .7 board divided into positions, a called line appearing; in multiple jacks on serea'al of said last positions, circuits extending from one oi said positions upon said first board to positioi-i upon said seco d b aid and ed to h we is physical connection said ansiv an ope 'ators ii-(lifi phone at one means in said one circuit at said one position of said first. board forautomatically freeing a line from said circuit.

9. A telephone system. including a switchboard dividedl'into s positions, a calling line appearing in answering terminals at a plurality of said positions, a' second: switchboard divided into posit-ions, circuits extend-- ing from: one of said positions upon: said first board to positions upon said; second board and adapted to have direct physical connection: with; said. answering terminals, manual: means for connecting said circuits to said answering terminals, an: operators set at said second switchboard. for said circuits, means for automatically connecting said operators set toone of said circuits when the same is: connected to one. oi? said answering terminals, means at said first switchboard for. indicating. to air operator thereat-whether or-not operators at certain of said: positions. on said. second switchboard are idle. or busy, and; subscriber controlled. means in: said: one circuit for. freeing the? subscribefs line: from said. one circuit.

10. A telephone system includinga-switchboard divided into: positions, acalling line appearing in: answering: terminals at a: plurality of said positions, a second switchboard divided into positions, circuits extending from one. of said. positions upon said first board to positions upon said. second board and adapted tohave physical connection with said. answering: terminals, means at said first switchboard for indicating; to

the operatorat one of. the positions of: said connect to the answering-terminals to dis tribute the: calls toidl'e: operators at said second switchboard, an:v operators set at said second switchboard for said circuits, auto-' matic means for connectingsaid 'operators set to: one or". said circuits upon-the connection of said circuit to one oi'said answering terminals-L providin-gfsaid' operators set is not already connected to another of said circuits, and subscriber controlled means for freeing a subscribers line from one of said circuits.

11. A telephone system including a switchboard divided into positions, a calling line appearing in answering terminals at a plurality of said positions, a second switchboard divided into positions, circuits extending from one-of said positions upon said first board to positions upon said second board, means for automatically preventing operative connection of more than one of said circuits at one time to said calling line in response to a call on said line, and a supervisory gnal operable intermittently to notify an. operator connecting" a: circuit to said calling line subsequently to the connection of another circuit to said calling line by another operator that. the said other operator has seized. the calL- 12.. A telephone system including a. switchboard divided into positions, a calling line appearing in answering terminals at plurality of said positions, a second switchboard divided into posit-ions, circuits extending from one of said. positions upon said first board topositions upon. said. second. board, test means for: said circuits whereby the first circuit tozoperatively connectv to said calling line in response to a. call. thereover will prevent a second circuit from. connecting to said calling. line, a supervisory signal, means for intermittently operating said superv-isory signal to indicate to the. operator that the call has. been. answered by; another operator, and: means for causing said sig 'al to operate. continuously to signal. for a. disconnection. H

13.- A telephonev system including a calling subscribers line terminating in multiple answering terminals; and. multiple lamps, a plurality of cord circuits at difierent operators" positions for connecting to said calling line, test means for preventing the operatives connection of. more than one oi said cord circuits to said. calling line at the same time in response to a-call over said line,asignal,v means for operating said signal inte-rmittently if two cord circuitsare connected tosaid line iuattempting to answer a call, and means for causing, said signal tor operate continuously to signal for a disconnection.

14. telephone system including a calling subscribers line andza called subscribers line, a circuit extending through two operator's" positions for connectingsaid calling subscribers line to said called subscribers line, a supervisory lamp at each of said positions, means at one of said operators positionscontrolled by a subscriber. for freeing hisv line from said circuit and for light ing the supervisory l'am'pat the said position, means responsive to-the disconnection of the terminalof said circuit. from the said calling line for operating the supervisory signal" at the other of said positions, another circuit for connecting to said calling line, and automatic means for intermittently operating said signal at said one operators position it said other circuit is connected to said calling line prior to the connection of said first circuit to notify the operator at said first cord that the call has already been answered.

15. A telephone system including a calling subscribers line and a called subscribefis line, a link circuit having an answering terminal for connection to said calling subscribers line and a calling terminal for connection to said called subscribers line, a pair of tromagnct means operative when the operator removes the answerlng terminal of said link circuit from the jack of said line to operate said signal.

17. A telephone system including a switchboard divided into positions, a calling line appearing in answering terminals at a plurality of said positions, a second switchboard divided into positions, a called line appearing in multiple jacks on several of said last positions, circuits extending from one of said posit-ions upon said first board to positions upon said second board and having manually controlled connection terminals adapted to be directly and physically connected to said answering terminals, an operators set at one position of said second switchboard, means responsive to the physical connection of one of said circuits to said calling line to connect said operators set thereto, means responsive to the connection of said circuit to said called line to disconnect said operators set from said circuit, and automatic ringing means for signaling the said called subscriber.

18. A telephone system including a switchboard divided into positions, a calling line appearing in answering acks at a plurality of said positions, a second switchboard divided into positions, a called line appearing in multiple jacks on several of said last positions, circuits extending from one of said positions upon said first board to positions upon said second board, answering terminals for said circuits at said first switchboard,

manual means for connecting said answering terminals to said answering jacks whereby calls are manually distrbuted to the operators at the second of said switchboards, automatic supervisory means for indicating to an operator at said first switchboard connecting to said calling line subsequently to another operator at said first switchboard that the call has been answered by said other operator, means for indicating to the operators at said first switchboard when the operators are idle at said second switchboard, calling terminals for said circuit at said second switchboard, manual means for connecting said calling terminals to said multiple jacks to complete connections, and automatic ringing means for signaling the said called subscriber.

19. A telephone system including a switchboard having a plurality of positions, subscribers lines terminating in multiple answering jacks at a plurality of said positions, a second switch board having a plurality of positions, multiple jacks for said lines at said second switchboard, groups of circuits extending from positions at said first switchboard to positions at said second switchboard, terminals for said circuits at said first switchboard for connecting said circuits to calling lines, means for preventing the operative conection of more than one circuit to a calling line at the same time,

supervisory means for indicating to operators connecting to a calling subscribers line, subsequently to the connection of another operator, that the call has been answered by said other operator, busy means to advise the operators at said first board which operators at the second board are busy, such manual distributing means in connection with the multiple line lamp distribu tion making it possible for the calls to be answered by different idle operators at said first board and to be extended to idle operators at said second board.

Signed by me at Chicago, in the county of Cook and State of Illinois, this 10th day of September, 1921.

GEORGE A. YANOCHOVVSKI.

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