USRE12090E - Testing system for telephone-lines - Google Patents

Description

, W. W. DEAN. TESTING SYSTEM FOR'TELEPHONE LINES.

APPLICATION FILED JAN. 31, 1903.

REISSUED MAR. s, 1903.

2 SHEETS-SHEET 1.

REISSUED MAR. 3, 19703.

w. w. DEAN. TESTING SYSTEM FOR TELEPHONE LINES.

APPLICATION FILED JAN. 31. 1903.

2 SHEETS-SHEET 2.

; wumwmm lmg .UNITED STATES j PATENT. OFFICE.

WlLLI AM w] DEAN, or CHICAGO, ILLINOIS, ASSIGNOR TO THE KELLOGG SWITCHBOARD AND SUPPLY COM PORATIONOF ILLINOIS.

PANY, .OF CHICAGO, ILLINOIS, -A COR TESTING'VSYSTEM FQR TELEPHONE-LINESQ sracn'zcanou torming et of Beiasued Lam- Patent No. 12,090, dated Marcha,

) Original 80. 717.978. dated January 8. 1903 Applicntionfor reins. filed nun- 31, 1903; Serial No. 141.390.

To all whom it mag concern.- Be it known that 1, WILLIAM W. DEAN, a & citizen of the United States, residing at Chi-' cage, in the county otCook andState of lili- 5 nois, have invented a centaip new and useful Improvement iii Testing; Systems for Tele phone-Lines, of which the following isa full,

\ ence being bad to the accompanying drawings, forming a part of this specification.

will know that the line is idle. In these sys tems as usually constructed heretofore a special test-terminal has been provided upon the switchboard, to which the tip of the testingplug is adapted to be touched in the making of the.test. The potential of'the special testing-terminal may be readily adjusted to the required amount to give the desired low click lathe operators telephone. Moreover, due to the employment'of the special testing-terminal,- the touching of the tip of the plug thereto to offer another path for current does not produce a click in' the telephone of the subscriber whose line is being tested.

The object of the present invention is to provide a-testing system particularly adapted to that'class of telephone-lines wherein no 4o specihl testing-terminal is provided upon the switchboard, one of the main-line terminals of the switch-socket or a terminal connected with one side-0f the talking-circuit during a connection, being relied upon for testing purposes. In this type of z-vitchboard-the potential at the switchboard-terminal used for testing will depend upon the voltage of the source of electricity employed for energizing various signaling apparatus. The voltage of clear, coucise, and'-exact description, refer- -nal is employed.

My invention relates to a testing system for On the other hand, if she hears no clickshe' the microphone at the substations and the .readily adjustable to suit the requirements of the testing apparatus. The potential at the testing-terminal is therefore considerably greater'thau it is where a'special test-termiminal, thus affording an additional path for current and lowering the potential of the lineterminal, a "click will be'caused in the re-- this type of telephone-line to obviate this objectionable click in the subscribers telephone.- ,Accordiugly I provide for each operator a testing-circuit having-a high resistauce and preferably also a high impedance and which preferably takes the form of a. relay which is adapted to be connected with all of the cordscontrolled by said operator, the relay or test-resistance device being normally in circuit with the tips of'all of the calling or When, therefore, the tip of the testing-plug is touched to the line-tertesting'plugs. When, therefore, the tip of anyone of the plugs is touched to the testingterminal-upon the switchboard, a current will traverse the relayor test device if theline is busy. The relay or device thereupon acts to control a local circuit containing a suitable,

source ofelectricity and the operators telephone or other responsive device. The strength ofthe current flowing in the local circuit may be readily adjusted as desired, and in this manner the strength of the click inthe operators telephone may be suitably adjusted. By making the relay of high resistance and with many turns the current flowing through the relay'a'nd test-conductor will be but slight, and, due to the large number of turns, this current will-effectively operate the relay. The relayshouid have considerable impedance, and this will cause the current traversing the relay amd test-condnctor to rise -in value gradually. In consequence the touching oflthe tip of the testingjplug to the testing-terminal varies the potenthe. relsyFthe-vsristion of the potential is s w l Jr; as n ay'ibe;d'esired.- I further provide means 7 w ,vii-oor relay from the tip of the; plug,' and so .wlmrehythe removal or the plug from the calling-plug.

' o :pcovision oi Inesnswhereby the testin'g'appm so usual practice heretofore. e

7 ms of my invention. 7

. showing amodiilcstion of the central-station i apparatus. Fig. 3. is a disgriim ehowingthe Y be understood however; that my invention with line-springs d d'upoc am a .9 cacao ti f: thereol slightly; since the-added pathj-restsagainst contact 7. which isconnectedto f hroughthe testing pass t e isot high:

" iistsucasual;-moi-eogi due. to the impedance ho'ccsnlt'is that thetesting cnrrentf relay andteshoircditwi-thfnnq jg manner *a'i'fecting the receiver of Lth'eg whose line is beiog W; t n preferablyprovideone relsy or re- :o j devi.ce man otfth'e calling-pings cue-operator, .this of course is ftiai feltnre oi" the in ve ues. LrQQyM'YbOP QQ {or each Mimi! j. on 0,1, such number, o -w wherebythe' insertion of a calling-ping in the m nch-socket of a'called subscriber will serve 1 automatically disconsectthe testing dw socket-serves to automatically reconnect the testing device orrelay withthe tipyof the ore of my in-v'entlonfisft'he;

A further fest rsths may he automatically-connected with d'dis'connected' from th'etip of the callingwithont't'he provision et. a third teriniy nsl upon the connecting-plug, as'has been the f I. have illustrated my invention in. the ac compsnying drawings inwhich Figure 1 is]. diagram illustrating two'teleplion'e-lines and thelcentrai-station" a psi-e Fig. 2-isa d agrsm manner in which s single testing-relay is associated with, aplu ral ity of cord-circuits. i {Like o hsrs'clprs refer to like p'arts throughout the severflj ms. v V e t The 'telephopm nes may beoi any approved type; and 1-. have illustrated telephone-lines of the well-ltnown Dunbar type. It will I is equally applicable to anyspecllic torn oi telephone-circuit 51 have shown the suhsta tton A' provided wiqi two iinihsa ",1e:tendi, ingto the central station snd terminating, 1e tiveiy, in: rings a' o', spring a nor. ll lyresting aga contact 1 and thespring oagainst course 8. Between the contacts" 1 and 2 the bstteryj 'aud indivldualiidica tor c areeonn'ected. Contact 4 is connected 4 the. several tions of the switchboard, and the contact 5 is connected with the line-thi'mbles d (P. The relay!) is connected between the contact 5 andgron'nd. When therelayb is energized, cc springs a. a'are attracted to cut out indica-' tor c and .toconnect limbs a and a. with the terminals of the switch-socket, At the subntstloh the usual 1 microphone and receiver 1 f arefconnectediwith't e con t 8. and the 5, switch-hoolt'f, which is ads ted to engage contact 8 when the receiver-is" iited,nortusl.y

grounded. .as shown.

gronndthrough bellf' and condenser I.

Thespecifl'c'torm of telephone-line herein,

. 1 1 The substation B shown upon the right s similar to-thst descri iii-connection with illnstrstedis not clsimed in thisal'aplilrzution.

subscriber A, and like parts havebeen indi cated by the some revference' letters;

The answeringplug p is provided with the is" usual tip p and sleeve p, the former connected with strand tsndthe latter with strand s. Thecalling-plng ois providedwith tip 0' sndsleeve 0, the former being connected -with strand t and the latter with strands.

ance usually ot-sboiit fittyohms. Thenpposite-poleoi' said battery 4 is connected with strands s and 8" through reia'ysh' and k,-

which alsoha've preferaolya resistance of shout 'iiity'ohms? One le-oi the battery is I g 1 he relay it controls contacts-m ned 14, and the relay hf controls contacts m and 13, the contact 11: being connected with one sideol battery r sad the contact m' wlth the op te's'ide.- In circuit with the contacts is the smpm', which constitutes contacts is the-clearing-out lamp of. Conthe'clearing-ont signal. Likewise-the relsyk controls contacts cand 16, and'the reisy k! controls eontsctsv and 16. In circuit with the v nected with'the contact-spring o and insu- 1 lsted therefrom is a supplemental contact 1;,

adapted when relsy k is energized to engage contact 11. The'spring of and contact 11 are interposed in the circuit of strand t, and when spring 0' reel] agsinst'ccntsct 10 said strand is opened,snd;isclosed'whe n spring 1:

is moved against contact 11. Contact 10 is connected to ground through relay aro'r other I test receiving and responsive device, which preferably possesses high resistance and impedsnce-ssy live hundred ohms. The relayz is common to a plurality ct cord-circuits usuv allyco'm-mon to oil of the cordscontrolled by v one operator, and the conductors extending to the contscts' lii' of 't'hediiierent cord-circuits branch from the point z. 1 The relay 4: controls Icon tscts :z' 9, the former being connected with ground-and the latter beingin'the present instanceoounected through the tertiary winding rstor's telephone set. The second- M9 7 arywind ng l" is connected between. the contacts 1'7 and-18 of the listening-key sod is included in circuit with a condenser l. The springs i' 'i' of the listening-key are connected, respectively,- with thestrsnds t and-s.

The primary 1 and the microphonei are con-- nected between the opposite sides ofthe bite tery r. ;The telephone-receiver 'i' is connected in circuit with the secondary 1''. The ringlug-key gis connected in the strand ,t and normally rests against contact 19 and is adapt contacts, substantia oi'lny invention in which the'contactsxand 9 of relay a: are connected directly in circuit-- with the telcphonefreceivert' instead of in circuitwith a tertiary winding 1"? The relay-' 5 contacts 2: and) thusdirectly'contrclthe f circuit containingthe telephone-receives, l't' will be understood that instead of a telephone-receiver any other responsive device may be employed'i'or testing purposes. It is to also evident that the relay a: may be'replaced.

by any other test-responsive devioef'or test-' indicator, bnt'wlthcnt the advantage of some of the features herein described g .I disclaim-herein the matter claimed in the [:15 application oi-Francis W2 Dunbar for tele-.

ghone -switchboards,' flied August 17, 1900,-

eluding'a plurality of testing-con tacts. a relay a 5 comments saidjcontacts and in circuit'thererelay and actuated whenever attesting-current ilows over the testing-circuit from anyo! said j ly as described;

2. The combination with telephone lines .with, a responsive device-controlled by said rectly with-one side of the talking-circuit; of testing apparatus including .a plurality of testingtei-minals, a relay common to said terminals incircnit therewith, and dreamsive device controlled by said relay, substantiallyns-described.

a. The combination with steepness-nus and a charging source of electricity, of a test-'.

o ingc-terminal'tor said line connected directly with one side or the talking-circuit and test-- ing apparatus including aftestingiontac -arelay in circuit therewith responsive dot? no controlled by said relay and means for auto- 5 mstically disconnecting said relay-from the circuit when a connection. is made with the line, substantially asdescribed. I

4. The combination with a telephone-line having one at the main-line terminals serving as a test-terminal, of testing apparatus com, prising a testing-terminal, a relay in circuit therewith and a responsive device controlled by said relay, and means toautomatically d'ise connect said relay when a connection is made with the line, substantially as described.

5. In a telephone system, the combination with stelephone-line having testing-contacts,

of testing apparatus including a testing-terminal adapted to, be brought into contact with ma the testing-contacts of said line; a relay normally connected with said testing-terminal, a responsive device controlled b said relay, and means for disconnecting sai relay from said testing-terminal, substantially as dQ' 6. in a telephone system, the combination with a connecting-plug, ot a relay normally lay with the terminal oi -said plug; and for sponslveidevice. oontroll'edby said relay, and

means actuated thy-the insertion of the'plng' .relay, su'dfan. electromagnetic device'com' having each a testing-contact connected, di-- therewith, substantially as described.

. 10. The combinationwith iconnectingopening ths trolled by the circuit through the other strand the res normal y connected with one-of said strands,

connected with the terminal thereof, a responsive. device controlled by said relay, and means for disconnecting said relay from said terminal when the lug is inserted in aswitch- Y jnn'ectlngsaid relay from the terminal there of, substantially as described.

' :8;- The combinationwithaconnecting plng' 8o and the strand associated-therewith, a I

i l, cleans i'or norinellyiocnuecting said re openin'g'the circuit throngh-sai stramLare- 8 I s a in a switch-seclret for disconnecting'said relay and for. completing the circuit through said strand, substantially 'as described." a

.. 9., The combination with acon-uecting-plug 9'0 and a pair oi strands associatedtherewitli, of

arelay normally connectedwith one of said stamina-responsive device contmlled by said"- trolled by the'citnllitthl'olllb the other arena (9 strands, for disconnectingsaid-relay fromthe terminal of the plug normally connected plug, and the strands associated therewith, '0! rec a. relay and a relay withone terminal of said'plug auditor strandsssociatedlwith said we; Q minal, and an electromagnetic device con tordisconnecting'sald relay and completin the circuit through said -flrstmention strand, substantially as described.

ll. The combination with a. connectingplug, having a pair of strands connected with tive terminals thereolt l a relay a responsive device controlled by said relay, an electromagnetic device fordlsconnecti-nrr us said relay'ircm said terminal, and means for closing circuit through said electromagnetic device and said'seccnd strand upon the'insertion of said plug in a switchcocky substantially as described. 1 12. The combination with a connecting plug, a testing device'nc'rmally connected with one terminalthereof, means for closing circuit through the otheriterminal of sal plug upon the insertion of the same in a switch-socket, and means operated by current over the circuit so closed by the plug to disconnect said testing apparatns.irom the first-mentioned terminal, said other terminal being included in the talking-circuit when a connection exists, substantially as described. I 13.- The combination with a connectingplug, of testing apparatus normally connected with the tip of said plug; means for closing andfmeans controiledbyresch'plug icrdis '9' device controlled: fthereby, means for normally connecting-Mid,

circuit through the sleeve ofsaid plug upon the insertion of said plug in aswitch-socket and means operated by current over the circult so closed to disconnect said testing apparatus from said ti p said sleeve forming part of the talking-circuit when a connection exists, substantially as described.

14. The combination with a connectingplug having a pair of terminals and strands connected with said respective terminals, of testing apparatus, means for normally connecting said testingapparatns with one terminal of said plug and for opening the strandconnected with said terminal and an electromagnetic device associated with the other strand andadapted to be energized when the plug is inserted in the switch-sd'cket to disconnect said testing apparatus from the termlnal normally connected therewith, substantially as described.

15. The combination with a connectingplug and a pair of strands connected with the terminals'thereof, of a source of energy and an electromagnet bridged between said strands, one side of said source being connected with a third conductor, testing apparatus, means for normally connecting said testing apparatuswithoneterminal of said plug and for normally opening the strand connected with said terminal, a telephone-line having one limb of the talking-circuit connected with said third conductor, and means for closing the circuit of said source through said electromagnetic device,the limb ot'said telephonellue and said third conductor upon the insertion of theplug in the switch-socket to thereby actuate said electromagnetic device and disconnect said testing apparatus from the terminal normally connected therewith, substantially as described. 16. The combination with telephone-lines having testing-contacts connected directly with one side of the talkingcircuit when the lines are switched for use, of a cord-circuit and acentral sourceofcurrent to furnish curre t for talkingassociated with the lines,.testin apparatus comprising a. testiug-terminal to cooperate with one of said contacts in testing,a test-responsive device in circuit with said terminal, the testing-circuit being of high resistance where :y when a busy line is tested the change of current therein is reduced, and automatic-means to remove said high resistance from the circuit when a connection is established, substantially as described.

17. The combination with telephcnelines having testing contacts connected directly with one side of the talking-circuit when the linesare switched for use, of a cord-circuit and a central source of current to furnish an 1'- rent for t-alkiu: purposes associated with the lines, testing apparatus comprising a testingterminal to cooperate with one of said contacts in testing, a high-resistance and i-St-I'8 sponsive device in circuit with said'terminal, and electromagnetic me'ansto removethe reto cooperate with a test-contact w p sietance during the conversation, substratutially as described. 18. The combination with telephone-lines having testing-contacts connected directly with one "side of the talking-circuit during a connection, of a cord-circuit and'a central source of currcntto furnish current for talking purposes associated with the lines, testing apparatus comprising a testing-terminal to cooperatewith one of said contacts in test-. ing, a high-resistance and test-responsive device in circuit with said terminal, and means to automatically remove the same during a conversation, substantially as described.

19. 'Phe combination with telephone-lines having testing-contacts connected directly with one side of the talking-circuit during conversation, of acord-circuit and a central source of current to furnish current for talk ing pin-poses associated with the lines, testing apparatus comprising a testing-terminal hen testing, a high-resistance and test-responsive device in circnitwith said terminal, and means to automatically remove the samenpon the connection of the cord-circuit with the line, substantially as described.

, 20. The combination with telephone-lines having testing-contacts connected directly wit-hone side of. the talklng-circuitduring conversatimnof a cord-circuit and a central source of current to furnish current for talking' purposes associated with the lines, test-f 'ing apparatus comprising a testing-terminal to cooperate with said contacts, a test-respou-' sive device in circuit with said terminals, the testing-circuit being of high resistance to pre- -vent a large variation of the'currcnt upon the line when tested, and means automatically actuated when a connection is established for cutting out said resistance, substantially as described. v

, 21. The combination with telephone-lines having testing-contacts connected directly with one side of the talking-circuit during a connection, of a cord circnit and central source of current to furnish currentfor talki ng purposes associated with the lines, testing apparatus comprising a testing-terminal to-cooperate with said contacts, a test-respon-.

sive device in circuit with said terminal, said latter circuit being of high resistance or i-tnpedance to prevent a largeor sudden .variation of current on the line when test-ed,'and

electromagnetic means automatically euer gized when a connection is established to cut out said high resistance or impedance, substantially as described.

22. The combination with telephone-lines having testing-contacts connected directly with one side of the talking-circuitdnring conversation, of a cord-circuit and central source of current to furnish currennfor talkingpurposes associated with the lines, testing apparatus comprising a testing-terminal to cooperate with said contacts, a test-responsive device in circuit with said terminal, the

I ing apparatus i rom said contact,

f 30 conductor, and a relay operated by current mam; being or high resistance and i'mpednnce'to prevent a large and sudden variationplfcnrrenton the'line when tested, and

means to automatically out out. said resistfance dnringaconversation, substantially as! described.

-23.- The combination with telephone lines y v nit testing -contacts connected directly W 'iiIh oneside' oi the talking-cinnit d nring a connection,v of cord-circnitfa'nd encentrai source .otcnrrent to inrnish current for tall:- ing purposes associated with the lines, testcom prising a testing-tbrniinal .tocooperate with said testing-contacts of. the

I .lines, a testing;conductor-connected with said teat-terminal, a high resistance in said condoctor to prevent an excess flow of current therethrou'gh when testing, and a relay opera'ted over a strand of the cord-circuit actufse ated, during a conversation to remove. said resistance, substantially as described. I

r '24, 'lfhe combination with telephones-lines having testeontacts connected directly with "no aided the talking-circuit during a con-i r5 ncction, ofaeord-circnit and a central source oicn'rrent associated with thelines, a'testingapparatus comprising a tip contact u n the, ng of thecord-cire'ui't, a testing-conductor a high resistance in said flowing over a talkingctrand of the cord-cib: cuit during a conversation to remove said re-' sistance, substantially as described. v

86. The combination with a telephone-line,

. or a testing-contact therefona eord-circuit'gs testing-circuit completed. overthe ti p-strand of thecord-cir'cnit, a higlrresistance in said circuit and a relay operaIe'd-by'cnrrent flowing over one of the talking-strands otthe o cord-cirouit'to remove said resistance, sub 7 stantiallyas described.

26. A telephone-line having a testing-contact, a cordcircuit, a testing-circuit completed over the tip-strand o! the cord-circuit, a test-responsivc-device in said circuit, said ircni't being of high rceistance to cut down the dew o! cnrrenttlierein, to the desired extent, and arelay operated over a talking strand of said 'cord-c'ircnit to reduce the re- 5e sistance of said circuit, substantially as described; .7 27. A tclepho e-line having a testing-contact, a cord-cl nil, stating-circuit completed over the tiphstrand'ot the cord-circuit, 5 a test-recponsi-ve device in magic an, 'sai'd' circuit being of high resistance cut down the how of current therein to the desired extent, and a relay operated over the talkings'trand o! the cord-circuit to remove eaiddeto vice, substantiallyas described.

86. The combination with telephone-lines" having testing contacts directly connected with one sideot the talklng-circui'twhen the. lines are switched for use, a plurality of cord- 65 circuits and a central source of current to furnish current lcrtalklng pn ated with the iinfiztsstin'g appsrstus cone rposee associswitches or line-terminals, one or each of is,oec

in, the testing-circuit being common to' the 'said cord-'circuitsand being of high resistance, and a test1responsivo device in said'cir- "prising stating-terminal for cach cord-clr- 'cuit to cooperate with said contacts in testcnit and means automatically actuated to dis- I cord-circuits when a connection is cetai tlishcd thereby, substantially as described.

v2o. The combination'wi'th mom nt-mics havinf testing-contacts therefor connected direct with one side of -thetalking-circuits .dnring conversation, of a plurality of, cordcjircnitsand va central source of current associated therewith and adapted to furnish current for talking purposes, testing apparatus comprising a testing-circnitcommon to said cords, said circuit-"being olqhi'gh resistance and impedance, atcst res. to device in said circuit, andi'mesns automatically disconnect said testing-circuit from any of the I I connect said "circuit when thecoid-circnits, are in use torconversation, substantially. as

deso ibed.

. f 30; The combination with triephone lines, ot a testing-contactthereior, cord-circuits, a testing-circuit commonto said cordoircn its and' complet'edovcr the tip-strand of each,- the said circuit being of high resistance, and a relay to: each cord-circuit and operated by current, honing over one. ol the talking-' strands of the cord-circuit to remove said resistan'c'e'iront the corresponding cord-circuit,

' "snbetsntiallyaedescribed; 1

,- 3i. Thtdolllblllltldli with cpltiJM-linss' having testingcontact, of cordcircni ts, a

test-responsive device in the common portion testing-circuit common to said cord-circuits and cornpletedover the tip-strand of each, a i

of said circuit, means to cut down the flow of current therethrough, and a relay for each cord-circuit operated over the sleeve talking strand thereof to disconnect the said common portion '0! I the circuit, substantially as described i 32. I with two or more-telephon'e-line circuits, each 1:: a telephone system, the combination provided 111th one or -more spring-jack switches. being provided with a'testing-contact, said tssti -cbntact bein connected to hneside ofthcta king circnito said linewhen switched for conversation, a cord-circuit aerninatin'g in a lug at each end, said plug n ed nectio'n is made with theliue, and means for rendering said signals inoperative a switch jat the'distant end of each. oi the lines, said switches controlling the current flowing over said to-two or more oi said cord-circuits and operxelectromagnetic device associated with the telephone-circuit by means of said cut-in key out reestablishinu the test-receiving circuit stantially as described.

adapted for each of said lines, a test-responsive device associated with said 'cord-circuivand common Med over a circuitof relatively high resistancc, said circuit. being: completed between the testing-contact of the test-plug and the testing-cont ct ofthe line terminal when the line tested s switched for conversation, an

said cord-circuit and controlling a contactin' the circuit of oneof said supervisory signal said electromagnetic device being adapted to, operate during conversation and to disconnect said tcst-rcceiving circuit and to substitute therefora' circuit adapted for conver nation, whereby the operator may cut in her after connection has been established with-' and whereby the line-circuit is snbjcct to no; undue disturbance when the ti=stisinndc,si1betantiaily as described. i I Y 33. A telephone-line circuit provided with one or more spring jack switches or line-terminals, one or each of said switches being provided with a testing-contacnsait] testingoontact being connected to one side of the 'taiii'ng-circnitot said line when switched for conversatlon', a cord-circuit terminating at one-end in a plug'pro'vided with contact-terminals adapted to register with the contacts of said spring-jack switches, an operator's listening-in key associated with said cord-circuit and adapted to cut the operatorsteie-' phone into circuit. a source of current associated with said cord-circuit and adapted to furnish current over said linewhen switched for conversation, a supervisory signal associated with said cord-circuit and adapted to be operated when connection is made with a line and means for rendering said signal inoperative controlled by a switch at the distant end of the line-circuit, said switch altering the flow of current over said line, a testresponsive device associated with said cordcircnit and operated over a circuit of relatively high resistancehaid circuit being completed between the testing-contactotthe testplug and the testing-contact of said line-terminal when the line tested is switched for conversation, an electromagnetic device associated with said cord-circuit and controlling the circuit of the said supervisory signal at one point and adapted to operate during conversation and to disconnect said test-receiving circuit and substitute therefor a circuit conversation, whereby the operntor may cut her telephone into circuit without recsttablishiug the test-receiving circuit and whereby the line-circuit is subject. to no undue disturbance when the test is m ade;snb-,

34. 'A telephone-line circuit provided with one or more spring-jack switches or line-terminals, one or each of said switches being provided with a testing-contact, said testing contact being connected tov one side of the talkated with said cord-circuit ing-circuitof said line when switched for conversation, a cord-circuit terminating at one end ina plug-provided with contact-terminals adapted to register with the contacts of said spring-jack switches, a source of current associated with said cord-circuit and adapted to furnish current over said line when switched for conversation, a supervisory signal asso-. ciated with said cord-circuit and adapted to be operated when connection is made with a liueiand means for rendering saidsignal inoperative controlled bya switch at the distaut end of the line-circuit, said switch altering the flow of current over said line, a testresponsive device associated with said cordcircnit and operated over a circuit of relatively high resistance, said circuit being completed between the testing-contact of the'testplug and theftesting-contact of said line-terminal when the line tested'is switched for conversation, an electromagnetic device associated with the said cord-circuit and controlling the circuit oi'the saidsnper visorysignal at one, point and adapted to operate during conversation and to, disconnect said test-receiving circuit and substitute therefor a circuit. a'daptedTor conversation, substantially as described.

35. A telephone-line circuit provided with one'or more spring-jack switches or line-terminals, one or each of said switches being provided with atesting-contact, tact being connected to one inc-circuit of said line when said testing-conside of the talkswitched for conversation, a cord-circuit terminating at one end. in a plug provided with con tact'terminals adapted to register with the contacts of said spring-jack switches, a source of current associated with said cord-circuit and adapted to.

furnish current over said line-when switched for conversation, a supervisory signal associand adapted to be operated when connection is made withaline and means to render said signal inoperative controlled by a switch at the distant and of the line-circuit, said switch altering the flow of current over said line, a test-responsive device associated with said cord-circuit and common to two or more of said cord-circuits and operated over a circuit of relatively high resistance, said circuit beingcompleted between the testing-contact of the test-plug and the testing-contact of said line-terminal when the line tested is switched for conversation, an electromagnetic device associated with the said cord-circuit and controlling the ciicnit of the said supervisory signals at one point and adapted to operate during conversation and to disconnect and substitute therefor a circuit adapted for conversation, substantially as described.

36. A telephone-line circuit provided with one or more spring-jack switches or line-ternllnals', one or each of said switches being provided with a testing-contact, said teeting contact being connected to one side of the talkinn-circuit of said line whcnswitched for consaid test-receiving circuit versation, a cord-circuit; terminating at one end in a plug provided withcontact-terininals adaptedto register-with the contacts of said spring-jack switches, a source-oi. current associated with said cord-circuit and adapt ed to furnish current over said line when switched for conversation, a test- -responsive device associated with said cord-circuit and operatedovera circuit of relatively high resistan'c'e, said circuit being completed between the testing-contact of the test-plug and the testing-contact of said line-terminal when the iihe tested is switched for conversation, an' elect-romhgnetic device associated with the cord-circuit and adapted to operate during conversation and to disconnectsaid iest-re-- ceiving circuit and to substitutetherei'or a circuit adapted for conversaiion. 37. A telephone-line circuit provided with one or more spring-jack switches or line-terminals, one or each of said switches being provided with a testing-con tact, said testing-contact being connected to-one side of thetalking-circuit of said line when switchedi'or couversation,'a cord-circuit terminating at one end in apiug provided with contact-terminals adapted to register with the'contacts of said spring-jack switches, a source oi current as sociated with said cord-circuit and adapted to furnish current over said line when switched for conversation, a test r'esponsive device aseocisted with said cord-circuit and common I to two or more of said circuits and operated its over a circuit of relatively high. resistance said circuit being com pleted between the testtug-contact of the test-plug and the testingcontnct of said line-terminal when the line tested is switched for conversation, an eleo-s tromagnetic device associated with the said cord-circuit and adapted to operate during conversation and to disconnect said test-rec'eiving circuit and to substitute therefor a Eircuit adaptedtor conversation.

88. A telephdn'egllne circuit provided with one or more spring-jack switches orline-terninals, one each of said switches being provided with-a testing'contact, said testing-contact being connected Ito one side of the talklug-circuit of said line whenswitched for c in- .versation, a cord-circuit terminating at no end in .a plug provided with contact-termin is I adapted to register with the contacts of s id spring-jack switches, a'source 0'! current associated wilh'said cord-circuit and adapted to furnish current over said line whenswitched I for conversation, a test-responsive relay common to two or more of said cord-circuits operated over a circuit including said source of current when the line tested is-swltched for conversation, said circuit being completed between said plug-testing contact and said jacktcstin contact, a relay associated with said cord-'c' rcnit andsaid source of current and adapted to be maintained in operation over a circuit established through one side otsthe cord-circuit when the cord-circuit is connected for conversation, said relay being adapted when operated to disconuectsaid test-responsive relay and to substitute therefor a circuit adapted for conversation.

'39. A telephone-line circuit provided with one or inore sprinc-jackswitches or lihe-te'rminals, one or each-of saidswitches being provided with atoning-contact, snitl testing-contact being connected to one side of the talking-circuit oi. said linewhen switched for conversation, a cord-circuit terminating at .one end in a plug provided with contact-terminals adapted to register with the contacts of said spring-jack switches, a source of on":-

rent associated with said cord-circuit aid adapted to furnish current over said line" when switched tor .conversat ion, a super-VL- sory signal associated with said cord-circuit and adapted tohe operated whenconnection is made with a .line, and means to render said signal inoperative control led by a switch" at the distant end of the line-circuit, said switch altering the flow of'cnrrent'ovor said line, a teat-responsive relay commontwo or more of said cord-circuits operated over a circuit including said' source of current when the line tested is switched for conversation,- said circuit being cornpleted between said plug-testing contact and said jack-testing contact, a relay associatedwith'said cordcircnitand said source of currentend adapted to be maintained in operation over acir cuit established through one side of'the oordcircuit when the cord-circuit'is connected for conversation, said relay being adapted when operated to closest one point the circuit con-.

taining said supervisory signal and to dlsconnee-t said test-responsive relay and tosubst-iy. tute therefor a circuit adapted tion.

for conversa to; I

40. In a telephone'system', the combination of a cord-circuit consisting of two talking strands terminating at oneen'd in a ping adapted for the testing. and connection 0! telephone-lines, lot a source ot eni'rsnt associated therewith, a test-.responsiv'edevtcs'op' erated over a circuit of relativelyl'higlgneaistance normally connectedctolthet'est'ing-eontaot of said fplug, a line-terminal consisting of two contsits adapted to register with the contacts oi id plug, one of said contacts.

being in connection with one side of the tall:-

ing-oircuit when the line is switched for conversation, said testing-circuit including): source of current'and beingcouipleted tween the test-contact of the said ping. and

the test-contact of the said line-terminal, a; relay associated with said cord-circuit and I therei'or a circuit adapted for conversa- -switchhoa'rd hone-f exchange system, the combination wi terna'te contact constitutes the terminal of extending between the test-battery and the unit through the said substantially as described in: apparatus at each board or a a switch provided with a normal and an alteri circuit through the relay to disconnect the terminal oi tion of the tip-strand and to for connecting a calling with a called subtions to the line-jacks upon the diderent 43. In a multiple-switchboard tele honerds or sect ons of a multiple switchboard, o! test-thimbles for the said jacks, cord-connecting apparatus at each board or section of the exchange includinga connecting-plug phonedin'es eatendingtrom subscribers stations to the line-jacks upon th'e'diflferent boards or sectionafit a multiple switch board, of test-thimbles for the said necting apparatus at each board orsection of the exchange,'including a connecting-plug for connecting a calling with a called subacriber, a switch provided with a normal and an alternate contact, atesting-c'onductor terminatlng in the normal contact,a test-responsive device in circuit with the testc0nduct0r, a testbattery connected at the remaining terminal of thesaid test-conductor while then!- an alternate contact, a minating in the normal cater in circuit with the test-conductor, a test-battery connected at the remaining terthe anaweringend of the tip-strand, a' conminal of the said teat-conductor while the alnection between the remaining terminal of the test-battery and the sleeve-strands of the cord-circuits, whereby the test-thimbles'may. be omnected with the said remaining termi-' nal of the test-battery and circuit through the tuting appliance completed upon the application of the connecting-ping to a test-thimbio of a busy line, a relay in the conductor the answering end of the tip-strand, a com the test-battery and the sleeve'strands'of the cord circuits, whereby the test-thimbles m be connected with the said testing appliance completed upon the application of the connecting plug to atest-thimble aleeveot the eonnectingand testing'plug, and

of a busy line, arelay in the conductor. ex-

ine'ans controlled by the con necting-plug and the called-aubscriberls jack for closing cirrelay, whereby the said switch may hethrown from its normal testcontact to the'alteraate' contact that is a terminal of the answering-section of the tipstrand, whereby the cord-circuit is completed,-

circuit through thesald rllay, whereby the test-con tact to the alternate contact that is a terminal at the answering-section of the tip.-

42. ,In a multiple-switchboard telephoneexchange system, the combination with telephone-lines extending from subscribers stations to the line jacks upon the difl'erent rda or sections of a multiple switchboard, of test-thimbles for said jacks, cord-connectsection of the exchange, including a connecting plug for connecting a calling with it called subscriber,

substantially as described.

exchanaa'system," the combination with telephone-lines extending from subscribers stations to the line-jacks upon the different boards or'sections of a multiple switchboard,

ing apparatus at each board or section of the cats contact, attesting-conductor terminating in the normal-contact, a test-responsive device in circuit with the test-conductor, a testttery connected at the remainingterminal while the alternate ainting a calling with a called. subscriber, a switch provided with a normal and an alternate contact, a

circuit with the test-conductor, a test-hatteryfconnect-ed at the remaining terminal of the said test-conductor while the alternate con tact constitutes awering end of the tip-strand, a connection betweene remaining terminal of the test-. battery a d the sleeve-strands L t the cordcircuits whereby the test-thin; as may be connected with the'said remaining terminal ing end of the tip.-strand,a connection between the remaining terminal of the test-battery andthe sleeve-strands of the cord-circuits whereby the test-thimbles may be connected with the said remaining terminal of the test battery and circuit through the testing appllance-completed upon the application of the connecting-plug to a test-thimble of a line, and a relay in the conductor exten ing between the testbattery and-the sleeve of'theconnecting and testing plug, the called-auhscribers telephone-line, in cooperatiouwith his spring-jack and the connecting-plnginserted therein, serving to complete testing appliance completed tipgn the application of the connectini-plug toa' test-thimble ,of a busy line, and a r lay in the c I nctdr extending between the test-battcryand the called-subscriberFs telephone-line u codperai tion with his spring-jack and th on'ucctingplug inserted therein, serving to com {Me I circuitthrohgli the relay to the con meeting or testing plug seecomplete the cord-circuit, substantially as described.

exchange system, the combination wit telejacks, cord-con scriber, a switch provided with a normal and testing-conductor tercontact, a test-indinection between the remaining terminal of tending betweeunhe test-battery and the said switch may be thr wn from its normal,

strand,whereb'y the cord-circuit is com pleted,

exchange includingacon necting-plngtor con testing-conductor termina't 'ing in the normal contact, a test-indicator in the terminal of the an of the test-battery and circuit, through the' sleeve of the connecting and testingplng, the

'ternate contact constitutes the terminal of remaining term ual of the test-battery and circuit through the 44. In a multiple-switchboard telephones '0! test-'thimbles for said jacks, cord-connect (1 Lawn not-{t the terminal oi." the connecting or testing plug,

section of the tip-strand and to'com let'e the cord-circuit, substantially as deecri 45. In a multiple-switchboard tele honeexchange system, the combination wit tale-- phone-lines extending from subscribers eta:

tions to the line-jacks upon the dliferent boards or sections of amultiple switchboard,

of test-thimblee for'the said jacks equated" with one side of the talkingcircnlt, cord-connecting apparatus at each board or section 0! circuits and terminating in the said normal contact, a testdevice responsive to a how of current over the test-conductor, a test-bats tery having connection with the remaining terminal of the said test-conductor the said alternate contact constituting the'termiual of the answering end of the tip-strand ol the cord-circuit, a connection between the remaining terminal of the test-battery and the sleeve-strands of the cord-circuits, whereby when aconnectionjs established the testthimbles are connected with the said remain- 4 ing terminal of the test battery and circuit through the testing-conductor is completed uponthe application of the connecting-plug to a test thimble of a busy line, a relay in a con-- ductor extending between the'test-battery and one'of the main contacts of the connecting and testing plug, and means controlled by the connecting-plug and 'a. subsc'rlbers jack for'closing circuit through the said relay, whereby the said switchhnay be thrown.

during an established connection from its normal test-contact to the alternate contact that is a terminal of the answering-section of I the tip-strand, whereby the cord-circuit is completed, substantiallyas described.

46. In a multiple-switchboard telephoneexchange system, the combination with telephi' ue-fines extending trom subsoribers'f stations to. the llne jacks upon the dilerent boards or sectionsot a multiple switchboard of test-thimblee' for .saidjack's directly con; nected with one side of the talking-circuits, cord-connecting a paratus at each board or section of the exc ange, including a plurality of cord-circuits and connecting-plugs for connectingcalling and called snbscriberstm.

gether fox-conversation, a "neutron-eats cord-circuit provided with a normal and an alternate contact, a testing-conductor termina'ting in the normal contact of eachswitch and having a portion common to. a plurality of said cord-circuits, a test device in the common portion of the test-conductor and responsive to current thereover, a test-battery having connection with the remaining terminal of the said test-conductor while the said-alternste contact constitutes theterminal of the answerlng end oi the tip;strau'd'o!- the cord-circuit, a connection between the remaining terminal of the team battery and the sleeveetrands of the curd-circuits whereby the testthitnbies are connected with the said remaining terminal ct the test-battery when a connection exists and circuit thronghthe testing device is completed upon the application of the connecting-plug to a test-thimble of a busy line, and a relay actuated by current from the test-battery over one of the talkingstrands of the cord-circuit and main contact of the connecting and testing plug when a connection exists, said relay serving to actuate saidswitch to disconnect the terminal of the connecting or testing plug section oi the tip-strandand to complete the cord-circuit for talking substantially as described.

Signed by me at Chicago, county of Cook,

Stateof Illinois, this 29th dayfof January,

WILLIAM w. DEAN.

Witnesses:

Bonner Lnwxs Anus, G'azaLLa Baum

Images