US1109618A - Telephone-exchange system. - Google Patents

Description

E. E. CLEMENT.

TELBPHC'NE EXDHANGE SYSTEM.

4. 1 0u 1 L, LU. p e S d e t m a D.. m 0 9 1 0| H ...u U J D E L I r R o I T A w L P n.. A

5 SHEET S-SHHET 1.

E. B. CLEMENT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JULY 20, 1906.

Patented Sept 1, 1914.

5 SHEETS-SHEET 2.

u 1 1 n@ `N 5 SHEETS-SHEET 3.

w la" (Juventa:

E. E. CLEMENT. TELEPHUNE EXCHANGE SYSTEM.

YAPPLILI'IN FILED JULY 20,1906.

Patented Sept. l, 1914.

E. E. CLEMENT.

TBLEPHQNE EXCHANGE SYSTEM,

APPLICATION FILED JULYZO, 191151 Patenten sept. 1, 1914.

5 SHEETS-SHEET 5.

@wimmm 'UNITED sTATEs I IENT CEEICE.

EDWARD E. CLEMENT,

or WAsHINGToN, DISTRICT 0F COLUMBIA, ASSIGNOR, BY

MESHE ASSIGNMENTS, TO FREDRICK C. STEVENS, OF ATTICA i NEW YORK TELEPHONFFEXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Sept. 1, 19]

Application filed .Tuly 20. 190B. Serial Noy 327,096.

To all ywiz om it may Concern:

Ile it known that I.y EDWARD E. CLEMENT. a citizen of the United States, residing at W'aShingtCn, in the District of Columbia, have inreuted certain new and useful IIuprovements in Telephone-Exchange Systems, of which the following is a specificationY` reference being had therein to the accompanying drawing.

Ny invention relates to telephone exchange systems and has for its object the improvement ot' such systems in the manner which will hereinafter appear.

It is my desire in the present invention to produce a semi-automatic telephone eX- change outfit in which the amount of connective apparatus will be sulistantially less than that of subscribers apparatus, and its control rendered more certain than heretofore possible.

The. intention may be. briefly outlined as follows: a uuniller of connective trunks approximatel)-Y lt) per cent. of the numoei` of lines, is provided, with terminal connections such that a calling line will be automatically switched to an idle trunk. surh trunk terminatin, Y in automatic selerting apparatus and haring associated with it certain relays which pass under the Control of the subscrihcr-v during connection. To Work the automatirl selen-ting apparatus` I provide operators who have automatic switching means` for connecting them tothe trunks when lines are calling hut at uo other time. Ilach operator hasl control of one or more. sending or impulse transmitting devices Wherrlrr suitable imndses` may he applied to the automatr- Selci-ting apparatus to produce any desired connection A rery import-ant feature f the invention lies in this lse'ndinfs', apparatusE tlu arrangyment of which enables me to use one common romnmtator or 4'ircuit breaker l'or an entire archange. All the opflattors" sending wheels run synchronously with this "oinmlltatnr. and instead tt' havinnr cath r liet-l prmided uith ,i certain numY bei of teeth to malte :in-l l'reak |hl circuit. I prmide Carli wheel will one unbroken tooth of sullitilid l "j,`ll' lf tsluy in the. in

naar

therrnore, there is no sparking at the contacts on the Wheels, all makes and breaks being at Athe main coinmutator, for the rea-- son that the make and break at each individual number Wheel occurs a little before or a little after the corresponding make or break on the main coininutator. Thus, for example, suppose the number 3 is to be transmitted, and the circuit of the number 3 wheel is therefore closed, the tooth on this Wheel cornes into Contact with its spring pen during the interval of break on the main eommutator, and remains in contact long enough for the main eomrnutator to make and break three times, passing ol' of its individual spring during` the third break of the main cornniutator. Thus it will be observed that. all deterioration due to sparking and the kick of coils in the circuits is confined t0 the main commutator which I construct very solidly, preferably with cornpressed mica` insulation and a carbon faced or solid carbon brush.

For the sake of convenience I shall illustrate and describe in this case selector and connector switches of the type known as the. Strow er, such switches being Well illustrated in t e Letters Patent No. 815,176 and No. 815.321, issued March 13, 1906 to Automatic Electriti Company as'the assignee ot Keith and Erickson. The primary selector and operators trunk selectinflr switches may be of the same generaltype, at least in so far as regards their contacts and the wa;v their contact arms and banks are arrangz-` ln one` particular there is a difference lr.. |n\ rimary selector switches for answeiing calls do not have any ertieal motion hut, simply rotate. Another point of difference is that I prel'er to use a power drive with a clutch l'or ear-li individual switch. although this is l matt-rial. and a step by step movement.. prt.- rally driven trom the main commutator an l lsimilar in every respect to the rotatingr nio-ement of the patented switches i fawniflari' truuk Vig. lod- :did all connection with Fig. l. liig. 3 snows the circuits of an automatic switch. Fig. lis imodiication of Fig. l wherein the prmary switch is connected directly to the 5 line.

showing the primary switch connected to the line and the secondary switch comiected tothe trunk.

Referring new to Fig.. l. the suhscribers station A comprises apparatus usual in cornvmon battery' systeinsonsisting of the trans-4 ;mitter, receiver, ringer-s, condenser and switch-hook. The line wires from this station terminate in the line relay M through the normally closed contacts of the cutoff -relay M. The relay M when energized places battery on the Contact am in the bank of the switch Z. This switch vvl'ien not busy;

is constantly rotatinfir being normally vzo nected to a constantly i'iteting shaft by' means of a friction clutch al engaging the .clutch e which is rigidly astened to the4 shaft. This clutch is controlled by the mag net Dzu which when energized attracts the arm d2", disengaging the clutch e thus` causing the spindle ZY carrying the wipers` to come' to rest. This magnet D2 is ener gized when the test wiper es rests on the test Contact 2" and the line 1 2 is calling.E and holding relay M energized. The trunk@ wipers 2* and es? are disconnected from the' trunk Wires 30 and 3l respectively by the normally open contacts of the relay D1".` This relay is energized in 4multiple with the magnet l)2O and is held energized by the ao. -tion of the relay D when the trunk is con-i` -ne'cted to the calling line. The relay D con`y 'nected to the rounded side of battery is tapped to the tip side of the trunk 30 Whilei 40 the relay D connected to the free side ofE battery is tapped to the sleeve side of the trunk 31, thus i'ur ',eshing battery to the call-` ing subscriber. T relay E is the starting' re ay andtis operated when the talking trunk is connected to a secondary trunk shown inq the lower portion of the drawing. This relay when energized locksitself through the contacts ea and c* and is thereafter con trolled by the relay Duthrough the contacts al and d. The relays S and S respectively,

each have one terminal connected to the contacts a*e and 25 in thc secondary switch Z. The relay S has its other terminal connected to the free side of battery. The relay 5 S which responds to impulses from the sending machine shown in Fig. repeats these impulses over the tip side of. the trunk 30 to the switching mechanism in Fig. 3. The relays S and S' also furnish battery for the l operator-"s set in the secondary outfit and at the same time connect hes' talking set to the trunk Wires enabling licf to converse with vthe calling subsrriber.

The secondary switch L" identical v. ith that of Z and its magnet D is energized;

Fig. 5 is still another modilcation'` manner that the magnet Dzojis energized by `the action of the relay M,j The rel-ayD40 1s connected in multiple with the magnet` D3". The relay T in the secondary outfit is provided With'a make before break Contact and through this contact is connected to. the Wiper 25", When` the Yrelay D4 is operated. 7When the switch Z comes to rest with its wipers in connection with contacts leading to the talking trunk.l the relays vT and S are connected in series. T he relay T 'becoming energized locks itself through the contacts t and 2 opening the contact t thus disconnecting itself from vthe `wiper' 255 and taking battery" oil1 of relay S. The action of the relay Si closes the contacts s and 8 there!)v completing the circuit of the relay E whian remains locked throughthe contacts e and e* and under control of the relay D. Ground is placed on the test contact e3 over the wire 18 when the relay D is energized upon being connected to the line and 1s removed by operation of relay E. The operation of the relay T closes the circuit of the lamp L which is the signalto the operator that there is a call. The relay H has its circuit closed when the operator depresses the starting button Kx' in Fig. 3. This relay in turn closes the circuit of the relay H which inturn closes the circuit of the motor in Fig. 2. After the operator releases the button K" the circuit of the relay H is maintained through the pen q which then rests on the metal portion of the Wheel Q25, the metal portion being connected to battery. The circuit of the relay T is normally oompleted through the contacts kw and It of the relay H', but after this relay is energized the circuit is maintained through the contacts 11,2 and ha of the relay H.

Referring noW to Fig. 2 a very important feature of this invention is shown wherein a common impulse generator supplies the entire exchange. individual selector wheels hav. g teeth of different lengths are provide These teeth are so proportioned and the wheels so run relatively to the main com-l mutator that they will always make and break a little before and a little after the circuit at the comrnutator is made and broken respectively, which positively avoids sparking at the Contact pens. This arrangement is Ashown diagrammatic-ally in Fig. 2 wherein I have illustrated the main commu tator, one set of number Wheels, an electric motor for driving the shaft common to all of these, and a set of operator`s buttons similar to those used in selective ringing systems in a great many exchanges. L type of button can be used provided that When one button is depressed it must be kept locked or. in an indicating. position until some other button is depressed whereupon the Erst button must be released and A nv 1 and Q5 are provided with teeth of ditierent lengths, the tooth on wheel Q1 being the' shortest while that of Q5 is the longest. The tooth of the wheel of Q1 in passing over a Contact pen transmits one impulse through the medium of the common commutator Q1". The tooth of the wheel Q" in assing over one of these pens transmits ve impulses through the same medium. A complete machine will have teir` of these wheels so that any digit from one to ten can be indicated by sending the appropriate number of impulses. In the drawing in order to economize space and avoid confusion, I show only the first five wheels. In practise these wheels are all one, the teeth being formed upon the surface of a drum which can be driven by a suitable' motor or shaft. The speed which I have found most suitable for this device and for the type of switches I here illustrate is approximately twelve revolutions per minute. For a line exchange which I am illustrating the first four wheels will be provided with three pens and the rc maining six provided with two pens each. These ens through which the impulses are transmitted are connected in their proper order to the buttons K1, K and K". The pen 1 is connected to the individual spring 7.1 ci] the key 7.'1 in the set K1 by means of the wire 74. Similarly the pen y ot the Wheel Q2 is connected to the spring 7,1 oit the key la of the set K1 by the Wire 75, and so on. The succeeding Wires of all the pens g go to the individual springs of the keys of theset K1. The second set of springs y2 are connected in the same order to the individual springs of the keys belonging to the set K2; the `third set of springs Q3 are shuilarly connected to the rindividual springs of the key set K3. The layout in this figure is intended for an exchange of one hundred lines or less, the two sets of keys K1 and V2 serving to control two sets of number wheels for selective purposes while the third set of keys K3 is' intended in the present case for selective ringing on party lines.

The wheel Q eontainlng the three tccth transmits what is commonly Called the rotary impulses to ail'ect the side switch mechanism in the connector switch. The impulses from this wheel instead of being controlled by battery through the medium of the commuta- 'tor Q1 sends grounded impulses operated directly by the teeth coming in contact with 'a single pen.

The wheel Q25 has an insulated point upon which the contact spring if nrn'mally rests. It' this wheel is started by the operation ol the motor the pen g riding on the metal portion ot' the wheel closes the circuit of the motor which will continue to run until the wheel Q*5 has made one complete revolution and the pcn q again rests on the insulatrd portion. The teeth on the wheel Q are so set that they come successively in contact with the pen q immediately alter the tccth of the impulse 'wheels have ceased sending their respective impulses.

The common springs T8 of the key set are connected together to a common wire T9. This common wire carries to the switches in proper sequence the actuating impulses.

To illiutratc clcarly thc operation olE this ficvicc, supposc it he desired to transmit over lhe wire Til the number i3. The operator (lepresscs the fourth key in the first set :nul the third key in the second set. and finally the third licy in thc third set. Thus the spring o" of the whccl tw* becomes connected to the wire 79; the spring q2 ol the wheel Q3 lwcoxues conucctcil through its wir@ to the wire T9. Now as the drum or the wheels rotule what happens is (his: First, tour impulses from "hc win-cl Q4, thcu a single impulse Yfron. the whcel Q, thcn thrcc impulses from the whccl Q; then ontimpulse 'from the wheel Q; then three impulses 'from the wheel (j, and finally u single impulse from the wheel Q, to crnuplctinu thc signal. Any one familiar with the Strowgcr .system ot' switcher: will at once pcrccivc that the wires i9 and Si can bc connected directly to thc vertical and the rfuury siclc of a switch rrunlr, rcspcctively, :nul the impulses will thcu serve to oper-atc the swilchcs pcrfcctly. I may here static that thc sole function of the whccl Q25 with its wiper f7 is simply to send in one complete set otE impulses and then stop. Obviously, if the operator sets up the signal ltcys :incl the impulsos were permitted to go dircctly into thc switch circuits' without any .slartingir point, great confusion would result.. For this rcason l have the various signal wheels always come to rest at a normal starting point which is controlled directly hv the wheel Q2 and the pen ([6.

lThe circuits of Fig. l thus iiescriluul are particularly :u'laptcd to operate with the trunk circuit 1shown in Fig. il.

Referringr now to Fig. il the connector switch consists of thc vertical relay V which respondingy to impulses over the vertical Side of thc trunk operates thti vertical magnet V2 which iu turn causes the spindle Z carryilngr the wipers` e and e to step up vcr tically. Thc relay V' connected to thc rotary side of the truuk responds to rotary impulses and operates the private relay U llO which in infn @more libe mechanically op- (grnlod fliiio mvlllll-HU nuwe 011e IBODQ l1S- connect' ig the vertical magnet V2 and in itsA i rv conneohing' the rohary magnet V3, nml the come time through the side Swich mao conocer;y thetip side or olie trnnli': no a contiict in the private relay which, when closerrl, connecte the test relay J". The relny l'rea-ipcnding to a. second set oli inry piilieeo over the ertifnl side of the troni; opernteetile rotary magnet V3 canning the spindle Z te robee mori lering#` the wipers to rei- 1t on contacte lending lio the deired line. The next rotary impulse coming in operates `the 'grivnc relay dl inthe come nmnner us he ore` causing che ei/fie switches to make #till hnother movemene. This lust movement oflthe side swillihe lisconnechs the rotary mn'gne'annl in iis piece connects the rclny ll' which, when operated, closes,y the circuit of the locking* relay X which completer` the circuit of the ringing relay Y. The relay R now in position to be controlled by the ihird ot impulses coming in over thc ver'isgni side of the trunk. This relay controle n set o relays W' and4 these ivlaye in turn control generator cnrrcnt ol lliiicrenl iiwincricies or polslrities. All of these ve; :im eelilocking endl have :i common controlling their lockK ingr circuito. This common Wire, ll), leilfle to :1 noramilly open mutuel in the relay X. This relay hol-oclug energized at the first' impulse of l'lw iiiiril Set places battery on this. wi c. 'ihr relay l is also energized in this iimfiiirr :imi miler the first impulse its armatore drops linck and clones the eircmt ci" lw voley ll" through *rho normally cimeli comincio of the rclny W5. rllic next inilnllw` optonline the relay R @losen the ciu-nii of rin relay W through the contarte; ol flic relay W :mil the normally r-locvcl calname oiIi the relay lV, nml after the ow x o the I"irvuit contenir ci' the wi kwel through the con ilu-i fw] i l .it the third impnlec lilo wi yl-i in closell through xyzil .finti "W0 und omini-is oi' the relay the iiiril impulse the W* is closed tl'irough amil W7 [Uhl loswl commi.; of the relzly Hui u llw relay illu Mahlow oi' tin- I'elnys il the normally ly". '.f\t llw i'v-nrlli iinpoiec lli circuit of ll'n relay lll in vlorioii iliiongli ille ColltzlCtS if iiic il-lnya VV. WC" nml il, It will lie sven from the foregoing :ii-criplion that I lmic :i set of Riep in' iegrIk inlay controlled lay the relay H', the fir-s1'. rel-ny of the Het ilevoniiligf energized when ii@ relay R be veines ilcinergizel'l. the sel-cnil relay becomes energized when the relcy R' becomes energizwi the Heiunil time, :ind the third Vrelay becomingr energi'fzm when the relay- R again hommes enrgizcil, om! so on.

Batterv is supplied to the called Bubscriber through the relay R and` retardation coil l1 which are normally connected 60th@ rollin end oil the trunk. The locking circuit o' the relay X is controlled jointly the normally close-d contacts of the rela. emi the normally open contacts-z3 an z2 c ontr:lied by the spindle Z. If the called :whscriher answers, the relay R becomes energized, disconnecting the relay X' which in turn cuts oil the ringing relay Y. 1f the vullen3 subscriber d'oes not answer, the relay X ie disconnected' y,when the calling subecriier hangs up histelephone disconnecting` the switch Z which upon returnin is normall position opensthe contact springs c2 and' e. The calling subscriber 'at the enel of the conversation automatically places buttery on both sides of the trunk circuit bperuting the relays V and V simultaneouch@ the fiction oiwhich closes the circuit of the test relay J which in turn closes the circuit of the release ma. net J. Battery is placed. on both sides of t e trunk circuib by the combination of relays in `the talking Girenergized which places battery through its 195 normally closed contacts to the conm-'cts in the relay E and fromh there to the trunk circuit. The next relay to drop back or to heroine (lenergized is the relay D which l :lo nt of being in Series with the line cut mi @hay through the primary selector sets. A iter the relay D becomes denergized the roi-.w lie disconnected and thus battery is relnfsoil 'from both Sides of the trunk.

Referring now to Fig. 4 instead of providing' earch trunk with e primary switch I connect one of these switches to each line and instead of being constantl rotated, it is normally at e standstill an only starts to rotate when the subscriber closes the line circuit hy removing his receiver,-` These Switches contain contacts leading to talking trunks. When the line relay M is energized, the magnet I)20 has its circuit completed and drawing down the arm d,` the clutch am engages the constaxtl rotating clutch. therebyV causing the spin le a earlying the Wipers to rotate until an idl ent energized longer than the relay D on 110 multiple wire leading to the conter-t 20 is -connected directly to battery through the normally closed contarte ol' the relav D. This relay. when idle is, of course eenen gzed and when busy is energized and nat tery is disconnected from the test ruutarl zu". Then this trunk is busy. the (lilies-eure of potential at contacts 2N" is such that a test wiper on any other switch in passing over one of them will not cause its rotoli relay M to be operated. To inake this clear I will describe the method ot operation which is as follows: the subscriber, u-nioring his reeen er, closes the circuit of the relay M which, attracting its armature. cluses the circuit of the magnet D2U causing the switch to rotate. l'rwhen the wiper 33 xnalics coni'iection with a contact leading to an idle trunk, such as is shown in the aceonulanying drawing, the relay M ini .aaliately gets di; ct current from battery l5 rough the contacts d* and ni; The energi/.ing ol' the relay M by this path disconnects the relay M and connai-ts the line wires 1 and 2 to the extensions 3 and 4 respeetively. and as soon as this happens, the relays l) and lil become energiz-:ed through the subscriheifs station. The relay D is prorideu `with a srt of malte before hreak contacts and upon operating, disconnects` direct` battery troni the relay Mby here breaking the contauts d* and d, but at the same time it closes the contacts Z5 and d. The resistance coil l is connected to battery and to the what il, and the relay M is thereafter held oul ergize hy ein-rent llowing through this coil` It ol course follows that the test wiper of any other switch in passing,lr over this rontact .216" will not operate its associate cutoff relay. The balance of the eireuit and the operation ol' the saine is identical to tha Shown in Fig. l and need not he described.

Referring nor.r to Fig. l hare shown a switch connecte'l to each line as in Fig. 4, but instead of having the secondary switch connected to a secondary outlit` l have it connected to the talking trunk. in this vase when ground is ronnected to the sterlina wire lo by the relay D the circuit oi the magnet D3 is closed. and noon operating draws down the :il-nula" Causing: the :un itrh to rotate. Then the wiper 25"' lindas an idle secondary outfit (which would have battery Connected to the Contact an" through the reh lay T) the relays S and T will be comitati-l in series and the relay S operating the relav .E in the saule manner in Fig. l dieronnects gri-'ouml from the starting u'iffo it thereby rpeningr the Circuit ol' the nua'wt Dt causing the switch to coni'A to rest. The balance ol' the circuit and operation is identical with that ol Fig. l and need not be deserihed here. lhese two Fips. i and 5 are simply modifications of Fig. 1, Fig. l

t :ing the preferred form. These rations modifications are shown so as to fully @over the lill'ereut methods of connecting a eallini,r line to a talking trunk and thereafter connecting the talkingr trunk to a secondary tattili 'oithe purpose of completing the f r num-tion through finiti-hing mechanism on the falling' end or tltfe talltiruf trunlf.

I will now describe the complete operation tracing a connection from the calling to the called subscriber, assuming that suh- -r-rll.ler Lin Fia. fl is the calling subscriber. ll'hen he takes down his receiver, line eircuit l and 2 is closed and the relay M is energized. The energizing ot this relay places battery on the Contact .2'0" through the el: wing: of the contacts m. and m. When the teelt wiper al" ot' the iuunially rm'olving switrh Z reaches this` contact. the circuit of the magnet lf2" is closed @rough the conlaute` Il aud d* of the relay l) and at the saine time the circuit of lha relay l)10 is closed in multiple with this magnet. The iuergiziug ot' the magnet lili draws down the arm d!" separating the two clutches al and al causing the spindle s2 carrying the wila-rrV 5" and 55' to corne to rest. The energizing of the relay ll" closes the contmls if and all and ff and d thereby conuertiuuj the trunk onto the line extensions l and l. The relays D and M are thus placed in `series and the energizing1 of the relay M disconnects the relay M and reuiorcs battery from the test Contact am. As soon as the rel-.ly M is operated, the relay l) liffuue-\ enorgijimal through the subscriber`s` stallen] and attracting' its armature maintains the rire-uit of the magnet D2" :unl relay l through the Contacts (Z2 and da. The energizing of the relay D places Iground on the starting wire 18 and Contact 5? through the nornmlly closed contacts e :ual f ot the relay F. The wiper 235 of the normally revolving switch Z on reaching this contact closes the circuit of the magnet D. llhe energizing of this magnet draws down the arm of a" causing the spindle earryiugf the wipers to come t0 rest with the wipers on contacts leading to the calling truuk. The first thing` that happens is that f relay 'l' is connected in series with the relay by the following path: battery B, 29, 452, fr, in". vl1. '.l, t2, t. 40, armature and contart of relay D, e, 5", S to ground. The relay 'l becoming energized looks itself through (he eontarts t and t2 and opening the ronlacls and t2 rennving itself from the nire llll so as not to interfere with impulses that are to he transmitted over thit wire. @le relay' S being' momentarily energized. attracts its armature and closes the circuit of the relay E by the followingpath: battery ll. 2S, 2l, s, s', 20, E, 15, d, 5d t0 ground. The relay E thereupon loeksitself through the contacts e* and e3 as the v e011- tact c* is connue-ted to tlurwnding .whlthe 1, The''s sei, @f impulses tu by fue will! are those transm weA smb

:um fringes Hw wehen; if;

s h# mamy by the pen which causes thc side switch to move one step, dwing the various arms, w50, w60, 107, and wou llic l.uid cmu'acts. The movenient of the arm vom discl nects the vertical n i il Y* und in its pl- 'fc connects the ro- 'ist Y, while lhe operation of the arm u; connects or placa"` the test relay J' iu yosiiinu to test the lin side ot the linc. 'lhs secr nil srt ol' impu numbering three, operator; tlzc it 1y Y which iu turn closis the wirf-uit o? the rotary magnet V3 causing thel spindle .'l to .rotate and bring the Wipers to rest on eontscts leading lo the desired line. "l ne secon-'l rotary impulse nou coming in operatie the relay u nich closes the circuit ot tin priruie relay l causing thc side suillxh to take another step bringing the switch arnu; to rest on the third contacts. During this second rotary impulse while the relay l" iz energized tbc tesi relay J' is connected directly lo the tip side of tbc line and il ille. lixul were busy the relay J would become energized and closing the circuit oi thc release magnet l restore the switch to its ncruuil position. Vile will take it for grant ed that the called line is idle, so therefore the su iii il arms rest on their respective contact, llic switch arm w50 disconnects the lrotary magnet Y and in its place connects rho relay l. The switch arms 'ww and um close their respciiflire trunk circuits while the switch arm wi" disconnects the test relay from the tip side of the line or trunk. The calling: subscriber is now connected t0 line number 'll. rlfhc third ol impulses now coming` in operate the relay V which in turn closesy ilu; circuit of the relay It. The rst one lli a: impulses affecting this relay causes it to close the circuit of the relay X by the` following path: ground, p2, p3, X',

320, p' 2109, to battery B. This relay now locks vu i-ll' through the contact the contact a il' infr connected to ground through the sin" 5s and .e3 which are controlled by the ich spindle. The winding of the relay t connected to battery throughthe norm-.illl used contacts 76,76 of the relay R. Battery Iuur placed on the locking contacts of tlu inging relay set W through the common wir l5() and the contacts m2 and 111:a of the relay el The number of impulses in this last set `are three which correspond t0 .the ringing number of the desired party.

The tiret impulse affecting the relay. R

does not a liefst any of the relays in the ring-` ing set Vr", but in nnediately after the first impulse when the relay R' drops back'the circuit oi' thel relay W* is closed by the followingpath: battery B, 309, m2, p",-p",

315, if rc2 104, to ground. The second nnpulse coming in operating the -relay R' closes the circuit of the relay W5 by tlie following path: battery B. 309, $2,192 p5, :l1 t. l uw; uw, W5 to groundf The operation of the relay ll disconnects the first generator and connects the generator G in its place to the. normally open Contactin the ringing relay Y. Immediately after the sei-ond impulso the relay R dropping back closes the circuit ot the relay WY through the patll already described to wire 315 and trom there through la', w, lwa, w", W, to ground. rl`he third impulse coming in closes the circuit of the relay lV7 through the path already described to wire 311i and tron: there through en, wf, fw, fw, fw, w22, W1, to ground. The operation of the relay W1 disconncct/` generator G2 and in its place conne( ts t c generator G which is of proper frequency or polurityto ring the bell at the desired station. Immediately after the third impulse the circuit of the relay WE `is closed in a manner similar to that already described in (connection with the'other relays. `The proper generator current is now placed on the contacts in the ringing relay Y. (lne terminal of the relay Y is connected directly to an interrupting machine Y and the interrupting nchine itself is connected directly to batte 1. The other terminal of vthe relay is connected to ground through the normally closed contacts p and ,112 of the relay R in series with the e011- tacts :r4 and m5 of the relay X. lVhile the ringing impulses are being sent and the proper relay in the ringing set 'W is being selected tlhe relay Y is not afected on account of the rapid making and breaking of the contacts p and p2. After the impulses have been sent and the relay R is in its normal position the circuit of the relay Y is closed and opened through the interrupting machine Y. W'hen its circuit is closed the relay -Y opens the trunk and pla/ces generator current on the calling end of the trunk. y This current is placed on the line intermittently and during one of these intermissions when the relay Y is denergized` and' the called subscriber removes his telephone the relay R becomes energized and opening the contacts p and p releases the relay X which From the foregoin description it will seen that the two su scribers are provided with a clear talking circuit,` battery supplied to the called subscriber fron'the connector switch and battery supplied tp the calling subscriber from the trunk. In this present arrangement there are two sets of condeusers in this talking circuit and also an additional b'ridgecaused by the relays V and V which arernot needed at this junoture. The relay X which is released when the called subscriber answers also unlocks the relays in the ringing set W thus pre ventd ,l

anismthrongh the contacts e, @i me l, i',

The relay l)7 is the next relay to ls-op thereby releasing the rela, battery from both siA o this combination it will be seen that n momentary impulse has been placed siinnltnnea ously on both trunk wires. Referring; now Y t0 Fig. 3 `this momentary i ipulfie oper-atea' the trunk..

the relay J by lie following: will J1-vwl 1 l* o, eg', J', batik-try B. This lutter relny o ating closes the contacts j :ind j energy.

i the rela s V and V closnxv the (1n-ruit oi f! :mii fi enmiwmney mme@ rolling, @merli iinlii'lliuu lo signi operfrtors nn':'inn;.i..n3 arranged in be automatically '1i 'rj to roi-neet its woche-l operatorie L m zrli lie link f'izvnit :iwal-cimeli willing.: line und ilwroby associate i im Gmini-rdiff l lin@L menne Ver Jionmiir Siri. to n' :mh

the release magnet .l thereby restoring-j 1 :n vwnwwbion if .my treni; to n switch toits normal pozition. l lo iwi ijn, Mim; :mil runner-g; By the term continuously rotzsi'el i mii Llwrvto Suk applied to the Switrliing Ineens in trie wg:- wi'fmziseljf 11e alwefribil. l pended claims, is meent @Mitch-:1a luii'injgi 3j. ln f. *gluem No Sysgtem, :i either or both of the following :.-lmixwiwl ylvonlity e! hui-: lim. ymllalitv of istieull) :i uniform motion o!" revolution wcnwwiw .wir vim-mw. :l douille .mit nlV of their Wipm: about the :ixirsof llirspimlu l :wtmmlr wiffiw .losmiil linie. the l1.|' 1`.` :is distinguished from :L StepJvy-stzjp nuwel mi nflnp'wl ,to mom I; i-.illlilgl linee` there nient about the eine axis, Mul iziespwrme un :um il Si mi zu (o Y'runner-tl the 0f Whether the smid uni'fn'ni num-nient lm helm 1.@ :an rqmrntors Set Continued for tlm pmwl @wir ilu twir wir; W1 Hwdmnism ation only or eiftnim-l in u MHVM.) n, l'u son U l'iofl; (2) u switching o wars Le U Step-bylsep motion or otlu-iiiiee :ein i, i in the Same angular direr'tion, the wel mieli having no normal or zero poe'ition :rml von- Sequentlv; no release derive 'for iotiu-iing ii. to that position.

l do not herein clzzini txihvadefl. trunks or secondary distributing nieuw io ators controlling devices baicnily or ,g cally, inasmuch as the basis; rml claims to this Subject matter are malle 1n copemling applications of mine disch g other species of' my invention mel ille numbers `and filing lates of wl'n l an; follows: Serial No. SELQVM. filon s pril 2.4)', 1907; Serial No. 383,874. filed Jnlr I2.

1907, and Serial o. 1907. v

Having thus described my invention what I claim and desire to Secure lr-ttere Patent is:

l 1. In e telephone exchange system, a ,elw rality of line circuits, a. plurality of link eircnits for interconnecting the emile, n double set of automatic s\vit .l1es.= afm-,interi with seid links, one set adapted to effect initial connection between links and lines, and the other set to be .driven in a determined manner to tlle `wanted linee.y mchenism sida ted tobe controlled by en Ofelatl 1012 fleeting the Second Se* et luitlw, zflilml tu muli operatori-i mi fmitr'li i- .wl mul martinmlmilly :ir-main! uilen :1 lin!U r' wwuwiiizi @lise tx'nn illm "'li opvrntmsl cow enti untoreir-it fl sie cme il): mi wt nini s emitrolv the opm'etors to the Hunks, aemeztnnrnilly e dewrzibelfl..

Vin :i teleplusne exeliswge Systmn, :i plurality of iler: dimite, :i plurality of mnneetia'e inutilr therefor less in man1- i ler than the i l 0;' oi lines, a primary 1to1* Switch erw-ii l*rnnlr mluqjrteel re connect the funk 'e a Calling l 4 wie, seleetor switch conemtnting the conm -ting or ceiling' terminal o the trunk, an operations nnswe nag und eontmiiing set, 'wd :i continuera@ rotated eecomary selector switch individual to set for connecting the same t the trunk,

.. substantially as descril'` l.

`6. In a telephone exchan e system, a 'lurality of line circuits, a nunber of trunks ess than the number of lines, automatic switches for connecting calling lines with 4the trunks, automatic switches for connecting thetrunks with wanted lines, operators impulse transmitting apparatus and telephonepsets, continuously rotated secondary selector switches, one individual to each operatos set-for connecting theroperators devices with the'trunks, and switches controlled byoperators for connecting the impulse transmitter to said trunks, substan- 7,. 2111' a telephoneL system,

tially-as,described.'-

a plurality of line circuits; aplurality of connecting normally continuously driven autov matic switches `for connecting said links other automatic switches to wan .ed lines; `contro ling vde- -to calling lines ;A for "connecting said links operators answering and ticos adapted zto ,determine `the operation of the secondfset of automatic switlc es, and

automatic switches for connectin Saidf to said operators answering` an ,controlling devices,.substantial1y as describedi; Y

M8., In a telephone system, a plurality of line circuits; a plurality of connecting trunks ;n normally continuously driven auto- .matic Vswitches for connecting `trunks to -calling lines; automatic-selective switching "devices for connectinv trunks to wanted lines; means controlledl by an operator for actuating said selecting devices; and automatic switching devices for connecting said operator-controlled means to a trunk upon said trunks being connected to a calling line, substantially as described.

l0. In a telephone system, a plurality of line circuits; a plurality of connecting trunks; 'normally continuously driven unto- Inatic switches for connecting trunks to calling lines; automatic selective switching dcviccs for connecting trunks to wanted lines; means controlled by an operator for actuating said selecting devices; and power-driven automatic switching devicesI for connecti saidoperator-controlled means to a truii said operators said trunks being connected to a calling line, substantially as described.

11. ln a telephone system, a plurality of lines, a pluralityr of interconnecting links therefor; means or connecting a calling line to one of said links, selective switching means for connecting u link with a Wanted line, a plurality' of operators sets comprisinr telephones and actuating devices for said selective switching means, and normally continuously driven automatic mechanism adapted upon connection ot' a link with a calling line to be automatically actuated so as to vconnect said link and its switching mechanism with an idle operators set, substantially as described.

`1:2. ln a tele-phone system, a plurality of lines; aplurality of links; a plurality of opcrators controlling devices normallydisconnected from the links but associated therewith; means for connecting a calling line to one of said links; normally continuously driven automatic means for causing said upon link to connect with an idle one of said operator`s controlling devices when said link becomes connected with a callingl line; and means responsive to said operators controlling device fpr connecting said links with desired lines. substantially as described.

i3. In a telephone system, n plurality of lines; a plurality of links ing said lines; normally continuously and mechanically driven automatic switches for connecting one ci' said lines that originates :l call with an idle one of said links; :i plurality ol operators controllinginwliuoisnis; auxiliary automatic switches ior enabling; :l link so rlioserrto bc sclectcil and connected with an idle one of said controlling mochar nsuls. and means responsive to said controiliug mechanisms for selecting a wanted line and connecting said .link thereto, substantially as described.

ll. ln a telephone system, a pluraliy of lines; l a plurality of links for interconnecting said lines; normally continuously und michnnically driven automatic switches for connecting one ci said lines that originates u call with on idle one of said links; a plurality of opcrutofs controlling mechanisms norm-filly disconnected from :nid links; auxiliary automatic switches. one lndivirlual to cach operators control mechanism,E for enabling a link so chosen to be sc-l lectcil and connected with an idle our ot Y said controlling mechanisms; and switching devices associated with said links, responsive to said controlling mechanisms for connecting said links to wanted lines, substantially as described.

15. 1n a telephone system, telephone lines; trunks; automatic switches; each trunkterinitiating in the wipers of an automatic switch. the said lines hein multiplcd through a plurality of `sai .automatic for inter-connertlili -llO

fl 2 'a switchen` and aipearing as waiting contncbl in said automatic switches, and enfvh of Said automatic Switol'ies inning n wiper shaft curi-ying the wipers of that Switch; am auxilifiry conductor for euch line and terminating in n uiting contacts associated with tho waiting Contact terminals of the iine; am inixil inry conductor for u trunk sind terminatingy in a, Wiper :issue-interi with the wiperS of the trunk; a. source of continuous power; -1 Clutch connecting Enid source of continuous power and ihr wiper shnf oi the avtomatii: switch of the trunk: and in elect-roinngnei; having its armature associated with the said clutch and having its helix associated with the said auxiliary ooi'irincior of the trunk, whereby the clutch muy he operated by the engagement of the Wiper of the auxiliary trunk conductor with a railing erniinnl of the line auxiliary Coudurier,

16. lin n telephone Syn ein eloplimni iinesg trunks; automatic switches nach trunk terminating in the Wipers of :in automatic smi-rh. the sind lines being nfmltzipied` through a plurality of sind automatic Switches und appenring :la waiting cont-mits in saisi nainn'mtic switches und each o? sani zwtonnitio switolies having' n wiper slaaf' Carrying the wipers of that Switch; an nu net having in` :immun-e :issnointeci with Sifiiii clutch and inwing its helix in circuit with the Suid :imiilnsry ronehietor of tlm i'niiii; and menne whereby mid eleoronmgnei may he energized wiiun snifi :mxiiiary 'onililaor :nukes rleotrimi -ziinnecion through its wiper itin-lilo waiting roulant oi" thv :umilinry conlllntor of :i (":illing lineq slilmtnn g r i animating in the .vnznrn of :in :iutonnitlc lizilly :as described,

lTv [n :i teirplione Hristrn'i.teirpliono imma; rnnlni; niio'lnntia Ksriitrii fach iriink tow ininniing in the wipers oi' nn automatic switf'li, the mili lines lining nanlipieei through a plurality of evil nit-matic nitriies nini iippmn'ing in, nailing commis in said nnioniriiio enfin-hem and rau-ii of said automatic switelios haring i1 wiper shaft carrying the wipers of that switch; 2m nunilial'y eomlnrtor for rin-ii iine. imo {erminnting in waiting mutuels iissmziateil with the waiting contant terminale of' ihn line; an auxiliary oonriln'l'or for :i trnnli :md terminating in n wiper n,-.so i:itol with the wipers of'Lho trunk; :l nourri of minimi-mie power; grlutrli erinnerung smul nonni or continnoua power :mil the wiper slml i tile automatic switch si no trunk; ai! eine ourne of rontinnonb' power: L

l l l l i l i inf/egim tronmgfnet having its arnnitnre associated with fluid dutch and having its helix assor'iiiteo with the said auxiliary Conductor of tho trunk whereby the eleotromngnet may be operated to control the clutch by closure of proper circuit from the wiper of the trunks said nuxiiiary conductor; and other circuits inliigited to continuo the operation of said eiviziionnignet fleiu-fnrlently upon the continusinei of lie Ciiliing condition upon the tele phone line lien nnwiciexeil Wit/l1 the trunk through the wipers ami (fontaine of the al1- tmnniiio switch, snbntantiifilly as described.

18. 1n a telephone system, teie )lione lines; trunks; automatic switches; enc 1 trunk tex'- niinnting in the wipers of an automatic switch, the said lines being lnultipleii through il plnriility of Sani] :iliionmtic ewitches and appearing 11S waiting contarte in nani nuto# innlnin switches, and einen of sind 'nntomntlc Switches; having :i wiper shaft wirrying the wipers of that switrh; un auxiliary con# iniciar for eaf'h line und terminating in winning contarte associated with the Wait.- ing Contact, terminals of the line; an auxi1- inry ':onducior for n trunk and terminating in a wiper associated with the wipers of the trunk; a source of rontinuous power; a Clutch connecting said source of continuous @inver :ind the wiper elnift o the :into- :nqnf fin-itch ol" the, twink; :in rlrirtroningnet ixiiingg irs nrnafiin sissorfiutefi wiill the .said ilnirlV nini inning itis helix aseoeieeii -with il' siii-fil :auxiliary rronilnntnr of the trunk winni-hy the eieetronnignet nniy he operated contini the fluir-l1 by ceioeui'o of proper n from the wiper oi' the iannli's said rij Condnnlzor; sind menus for noniinungg iiie ognfmtion of sniil eecli'oxnegnet ilepenflontly upon ihr: continuanre of the 'Jiliing Condition upon lie telephone line Then i minted with the rnnk through ille wiiziere nini contars o? the nmoinniic :writeln siiiififinnnlly :is eiesurilieifi.

lil. in n ieieplione n vtein; telephone fines; trunks; automatic swiuhes; Carli trunk tei switch, the said lume lining mntipled through n iinriiiitjv of Sani aritomntio in waning contacts associated x 'hitl wniling rontaci; terminals of the vMine;

iiiuilinry r-oniiiictor for :L trunk and termin :uiting in :i Wiper :wsofiutml with the wipers o5 lni trunk; n nmirro of rontinnons power; e c'filltrll connecting Said smurf-c ol= Continxb omi power nml Un* Wiper rsiiuft. of ille mitonmie Mvitnli of the ilunk; :in elects-mung ne?, having its nrmntilro associated with the miel clim-li and having im helix in vii-ruit with Ilw Suid auxiliary ionlllutirir ol' the from the other terminal of said source of current to the auxiliary conductor of said line when said line is ceiling, said two conductive paths being connected when the link wipers are in connection with the waiting! contacts of the line when calling whereof said electromagnet may be operated to conl trol said clutch to stopthe VWipers upon the contacts of said line when calling, substantially as described.

24. In a telephone sistemi; en automatic switch having movah wipt-rs and fixed waitin?` contacts es parts thereof; o telephone ine having speechcircuit conductors and an auxiliary conductor terminating in waitin contacts of seid switch; a connective lin circuit terminating in wipers of seid switch; a source of power; e clutch adapted to connect said source of power to said wipers and wherethrough said wipers may be continuously driven; an electromagnet controlling said clutch to disaeeociate said source of power from said wipers; a souroeof current; a conductive path extending from one terminal of said source of current `through said electromagnet and to a wiper Ain said switch making connection at intervals with the auxiliary conductor of said line; c conductive Path extending from the other torminal o seid source of current to the aux iliary conductor of said line when said lineI is calling, said two conductive paths being connected when the link Wipers are in connection with the waiting,r contacts of the line when calling whereby said electromagnct in uy be operated to control said clutch to stop the wipers upon the contacts of said line when calling; e cut-olf relay associated with said line sind controlling the current path from the source of current to the auxiliary condoctor of' said line, said ath being inten rupted ae a consequence o the encrgizction of said cut-olf relay; and e relay associated with seid link and adapted to control the energization of said electromagnet subsequently to the operation of said cut-oil relay. substantially as described.

25. In :i telephone system; nn automatic switch having movable wipers and lin-eli Waiting contacts as parts thereof; :1 lehphone line' having speeclrcircuit conductors and an auxiliary conductor terminating in waiting contacts of said switch; a connective trunk circuit terminating in wipers of said linvitch; e source 0f power; a clutch. adapted to connect said source of ower to said wipers and wherethrough sind wipers may be continuously driven; nn eleriromugnet controlling said clutch to dis: senciate said source of power from said wipers; a source of current; a conductive putlz ext/ending from one terminal of said sonrcc of current through said electromagnet and to n wiper in Srrid Switch making rouncction nt inter vals with the auxiliary conductor of mid lline; e conductive mth elcniling from the iothcr terminal ol' Suid Source of current to the :auxiliary conductor of will i'nc when scid line is, Polling seid tiro conductive paths being roiiucciod when ihr trunii wipers are in connection with the wailing' contacts of the line when railing wharf-why :wifi electro magnet may lic opcroteii to control said 4vlulch to Stop the ui'igune upon thc contacts ci Suid lint-1 hun railing: :it cutoff relay 'neeocinterl n ith sziizl liuc und controlling the current path iron; the sour-re of current to the auxiliary conductor of acid line, said j path being interrupted :is :.i consequence o the energization et said cui-nii relay; und means for controllin thc energization of jsriid electroniagnet eter the operatitjp of LSeid cutoff relay Suhstcntinly descrlbed.

26. lu o telephone System, :in automatic primary ecirc-tor Switch: in automatic coIr tinuously rotated secondary .eciector switch: n line appearing in waiting connu-ts ci seid primary selector vewitch; :i iinir oipeoring in wipers of Said primary Scio-lor mriich :md in waiting contacte of Said Secondary selector switrh; menne for stopping the wipers of scid prinniry Selector Switch in electrical connection with a culling line; menus for topping the wipers of Suid secondary selector switch in electrical connection with the waitin#r contacts of seid link when prinmrily conncctml with will line, Selective :nouns adapted to councct the link with wanted linee und an opcrntoi"s set associzatw! with Huid lwcondary Selector switch and cnuiprisng :1 telephone :1nd actuating means i for :mid liuc Selur-l ing menne. substantially as described.

2T. In n telephone syslcnn nu nutonmtic prinmry selector wwitch: on :mtonmtic ron- Linuously rotated secondary schw-tor Switch; a linc appearing in Waiting footnote o'f miel primary selector senin-h; n trunk appearing,r in wipcrs of son] primnry iscector switch und in uniting contacts of miei scconi'lery selector switch; u source ci current; o relay associated with .Huid liuc :Hui mluptcd `to connect one terminal of :mid source of current to tho tesi terminal of nid iinc in Smid primary ssi-lector Switch; und .fl reiziy associated with. Suid trunk und iuisxncd to conA ncrt one saisie of @nid fiom-"e oi' current to the trat terminal of Suid trunk in said ecc-A oudory ,selector switch, nid rrlnv )tinted with Scifi trunk living energized when nid trunk ie connected through seid primary Hclcctor switch with a culling line, subst-:iniinily :is described,

28. Vlo i1 telephone s wtcin. lines; nu au tonmtic primary selector :mitch: al trunk; menne for connectingr Suid trunk through Suid automatic primary .Selector Switch to a calling one of Quid lines: :in automatic com tinuouslv rotated :secondary Heier-lor Switch, having ivaiiing contarte connected with Suid trunk; a source of current; and a relay associated with said ,trunk` and operated upon connection of said trunk with a calling line, adapted to complete a path from a waiting contact in sald secondary selector switch to one terminal of said source of current; and means whereby the wipers of said secondary selector switc may be stopped in connection with the trunk when said relay is operated, substantially as described.

29.V In a telephone exchange system, a plurality of lines to be interconnected, a plurality of automatic switches for effecting the interconnection, but normally disconnected from said lines, continuously rotated switches for connecting'` the said automatic switches to calling lines, and an operators sender for controlling said automatic switches, said sender comprising a key board having keys or buttons arranged in groups corresponding to the digitsof the numbers to be called, and means for connecting lsaid sender to any of said automatic switches.

30. In a telephone exchange system, a plurality of lines to be interconnected, a number of trunk circuits less than the number of lines, automatic switches adapted to connect said trunk circuits to called lines, a plurality of operators senders for controlling said autom tic switches, said senders being less than/,vt e number of trunks, a normally continually rotating switch for' connecting each trunk with a calling line and means for connecting the said senders to the trunks.

31. In a telephone exchange system, a plurality of lines to be interconnected, a number of `trunk circuits less than the number of lines, automatic switches for connecting said trunk circuits with called subscribers lines, an operators sender for controlling said automatic switches, normally continually rotating switches for connecting the trunk to calling lines and means to connect said sender to said trunk circuits.

` In a telephone exchange system, a plu- I rality of lines to be interconnected, a plurality of automatic switches for eil'ccting the interconnection, but normally disconnected from said lines, normally continually rotating switches for connectingr the said automatic switches to calling lines, and an operators sender for controlling said automatic switches, said sender comprising a key board having keys or buttons arranged in groups corresponding to the digits of the numbers to be called, and means for connecting said sender to any of said automatic switches.

33; In a telephone exchange system, a plurality of lines to be interconnected, a number of trunk circuits less than the number ot' lines, automatic switches adapted to connect said trunk circuits to called lines, a plurality of operators senders for controlling said automatic switches, a continuously rotated switch, per trunk, controlled by the receiver 4hooks at the subscribers station for connecting the trunks with the calling lines and means for connecting the said senders to the trunks.

34. In a telephone exchange system, a plurality of lines to be interconnected, a plurality of automatic switches for elfecting thc interconnection. but normally disconnected from said lines. continuously rotated switches ,controlled by the subscribers receiver hooks for connectingr the said automatic switches to calling lines, and an onorators sender for controlling said automatic switches, said sonder comprising a key board having keys or buttons arranged in groups corresponding to the digits of the numbers to be called, and means to connect said sender to any of said automatic switches.

In testimony whereof I al'lix my signature in presence of two witnesses.

EDWVARI) E. CLEMENT.

Witnesses E. EnMoNs'roN, Jr., JAMES II. Mann.

Correction nf'Letters Patent No. 1,109,618h

trunk; asource of current; and a relay assovcontact in said secondary selector switch to "one terminal of said source of current; and

meansfwhereby the w1pers of said secondary selector switch may be stopped in connection with the trunk when said relay is operated, 'substantially as described.

' 29. In a telephone exchange system, a plurality of lines to be interconnected, a pluralsender y i It is `hereb 'certiiied that i 1914 yupon lrhe application of Edward E. Clement, of Washington, i i a Telephone-Exchange Systems, an error appears ity'of automatic switches for effecting the interconnection, but .normally disconnected from said lines, -continuously rotated switches for connecting the said automatic switches to calling lines, and an operators for controlling 'said automatic switchessaid sender comprising a key board having keys or buttons arranged in groups corresponding to the digitsof the numbers to be called, and means for connecting lsaid sender to any of said automatic switches.

'30. I 'n a telephone exchange system, a plurality of lines to be interconnected, a number of trunk circuits less than the number of lines, automatic switches adapted to connect said trunk circuits to called lines, a plurality of* operators senders for controlling said autom tic switches, said senders being less thanft 'e number of trunks, a normally continually rotating switch forl connecting each trunk with a calling line and means for connecting the said senders to the trunks'.

A3l. In atelephone exchange system, a plurality oflines to be interconnected, a number of trunk circuits 'less than the number of lines, automatic switches for connecting said ltrunk circuits with called subscribers lines, an operators sender for controlling said .autoniatic switches, normally continually rotating switches for connecting the trunk to calling lines and means to connect said sender to saidtrunk circuits.

In a telephone exchange system, a plul nt in Columbia, foi an nnproveme in the printed specification requiring correction as follows: Page',

Alil-5i., and insert the following paragraph:

I doqnot claim broadly lie/rela t/Lefu/ndomenlal rality of lines to be interconnected, a plurality of automatic switches for effecting the interconnection, but normally disconnected from said lines, normally continually rotating switches for connecting the said automatic switches to .calling lines, and an operators sender for controlling said automatic switches, said sender comprising a key board having keys or buttons arranged in groups 'corresponding to the digits of the numbers to be called, and means for connecting said sender to any ot saidY automatic switches.

33'. In a telephone exchange system, a plurality of lines to be interconnected, a number of trunk ,circuits less than the number of lines., automatic switches adapted to connect said trunk circuits to called lines, a plurality of operators7 senders for controlling said automatic switches, a continuously rotated switch, per trunk, controlled by the receiver hooks at the subscribers station for connecting the trunkswith the calling lines and means for connecting the said senders to the trunks.

Sli. In atelephone exchange system, a plurality of lines to be interconnected, a plurality otautomatic switches for eilecting the interconnection, but normally disconnected from said lines, continuously rotated switches ,controlled by the subscribers receiver hooks for connecting the said automatic switches to calling lines, and an oncrators sender for controlling said automatic switches, said sender comprising akey board having keys or buttons arranged in groups corresponding to the digits of the numbers to be called, and means to connect said sender to any of said automatic switches.

In testimony whereof I atiix my signature ni presence of two witnesses.

E. EnMoNs'roN, Jr., JAMES II. Mann.

in Letters Patent No. 1,109,618, granted September l,

District of strike out lines features of the system dlsolosed,

'including primary andr secondary distributing means,4 as suoli, broad cla/ms to llws subject matter cmdlo the several other matters disclosed lul not claimed herein, loing contained amy oopendz'gny application serial No. 858,481, jlled August 25, 19111, as a continuation la parl of serial No., 3l25,096/t`lod June 23, i -also contained 'i/n other copmcling a V E? 1907' 383 87,4 lcd July 15, 1907 cmd 383,87o, APTZZV 0 7 y ,f should be resid with this correction therein that the the record of the case in the Patent Otiice.

that the said Letters Patent same may conform to i [sulla] applications as follows:

1.906. 'Related claims are l Ser/al Nos. 369,201', jlled filed July 15, 1907,' and It. F. WHITEHEAD, Acting Uommlssioner of Patents.

Cdrection lnfletters Patent No. 1,109,618

.1914, 'upon the application of Edward E. Clement, of

It is hereby'certifed that in Letters Patent No. 1,109,618, granted September 1, Washington, District of Columbia., for an improvement in Telephone-Exchange Systems, an error appears in -the printed specification requiring correction as follows: Page 8, strike out lines i1-5,2., and insert the following paragraph:

I do not claim roadly herein the fundamental `featuras of the system disclosed, including primary anal secondary distributing meanysas suc/L, broad claimtl to this subject matter ani/tto the several ot/r 'matters disclosed lut not claimed fzevrein, lei'ng contained in, my copendiny application serial IVE). 858,481, Jled August Z5, 1.914, as a continuation in part ofserial No., 323,09fz'led June 23, 1.906'. -'Related claims are -also contained 'im other copmdi'ng applications asfollows: Serial Nos. 369,201', led

April 20, 1907, 383,87@ filed .fu/y 15, m07; and 383,8?5, filed July 16, 1907,- and that the said Letters Patent should be read with this correction therein that the same Iilay conform to the record of the case in the Patent Oice. Signed and sealed this 22nd day of September, A. D., 1914.

t[smh] R. F. W'HITEHEAD, Acting C'ommissifmer of Patents.

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