US1677451A - Matic electric inc - Google Patents

Description

July 17, 1928. 1,677,451

E. JACOEBEEN SEMIAUTOMATI C TELEPHONE I SYSTEM Ori inal Filed March 15. 1919 4 Sheets-Sheet 1 IUUEUZUP- ETZZLZ Jacubzen Juiy 17, E928, 1,5577A51 E. mcwwws SEMIAUTOMATI C TELEPHONE SYSTEM Original Filed March 15, 191 4 Sheets-$heet 2 m 17, ms.

E. JACOBSEN SEMIAU'IOMATIC TELEPHONE SYSTEM 4 Sheets-Sheet 5 Q A A m fi n 8.

w. 2 m z SW Original-Filed March 13, 1919- IZUEZZZUP- Enid-K550275511 July 17, 1928.

- 1,677,451 E. JACOBSEN SEMIAU'I'OMATIC TELEPHONE SYSTEM 4 Sheets-Sheet 4 OriginalUFlUied March 15. 1

[madamfimf aanbsen Patented July 17, 1928.

UNITED STATES PATENT OFFICE.

EMIL JACOBSEN, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO AUTO- MATIG ELECTRIC INC OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

SEMIAUTOMATIC TELEPHONE SYSTEM.

Application filed March 13, 1919, Serial My invention relates in general to semiautomatic telephone system and more particularly to an improved method oil extending calls in such a s stem. By extending a call is meant the operation. performed by one party when called to extend the connection from the calling party to some other called station.

Among the features and objects of my invention are to provide means whereby when a connection is set up from a calling party through a main exchange t a branch exchange attendant, the attendant may then operate certain switches in the main exchange to extend the connection from the main exchange to another branch exchange without disconnecting the calling party from the extended connection.

The above results are accomplished by providing a special selector repeater in the main exchange which has access over two way trunk lines to a branch exchange and which selector repeater may be operated in a certain manner by the attendant in the called branch. exchange to extend a connection fllODl the selector repeater through a line switch associated therewith to selector and either to another c: lled line in the main exchange or to another branch exchange. A system oi? this character is especially valuable where a company has two branch otliccs each equipped with a branch exchange. Now when a call comes into a branch exchange and it is found that the party desired or the information desired must be obtained from the other branch olfice, then the attendant at the first called branch can extend the connection to this second branch exchange without making it necessary for the calling party to hang up and call again.

Referring to the accompanying drawings Fig. 1 shows the usual calling substation A and individual line switch C having access to selector switches such as D which selectors have access to selector repeaters E (Fig. all of which equipment in the main or central oflice. A line switch C is associated with this selectorrepeater E (Fig. 2) which is used only for special calls.

The selector repeater E has access to a number of two way trunk lines extending to branch exchanges one of which trunk lines is shown extending to a branch exchange attendants circuit F (Fig. 3) and through the No. 282,442. Renewed August 26, 1927.

attendants circuit to a connector H (Fig. 4) which has access to lines in this exchange. This two way trunk line may also be used for calls in the opposite direction in which case the line switch C is used to connect with the regular selectors in the main ex change. It will be understood that the line switches C, C and C all have access to selector switches such as D (Fig. 1) for completing connections in the main exchange.

Having pointed out the general features and aspects of my invention, I will now describe the operations in detail when a subscriber at A calls a subscriber such as A (not shown) of the P. B. X. at which the attendants position is located, and when the attendant at F extends the connection to another P. B. X. subscriber.

lVhen the subscriber at A removes his receiver to initiate a call a circuit is closed for the line relay 2 of the line switch C in series with the line. Relay 2 operates to close a circuit for the pull down winding 3 which opcrates to open the springs 1 and 5 and also to close the springs 6 to 9 and 10 to 13, inclusive, to extend the line of substation A to an idle selector D. As soon as springs 6 and 10 and springs 9 and 13 are closed a circuit is closed for line relay 14 of the selector D in series with the calling line. Relay 1 1 closes a circuit for slow release relay 15 which grounds the holding winding 16 of line switch C and prepares the circuit of vertical magnet 17 and series slow relay 18.

The calling subscriber A now operates his calling device in accordance with the first digit of the called number. Relay 14 in response thereto operates magnet 17 a corresponding number of times to step the wipers to a desired level of contacts. Assuming that the selector repeaters E are located in the tenth level of the selector bank then this first digit will be nought and the wipers of the selector D will be raised to the tenth level. of the bank. As soon as the impulses of this digit cease, relay 18 falls back to close a circuit for the rotary magnet 19 through contacts of relay 20. Magnet 19 operates to step the wipers onto the first set of contacts in this level and if this first trunk is busy relay 9.0 will again be energized to close the circuit of magnet 1.9 as soon as magnet 19 closes springs 21.. This alternate op lllll vll) eration of relay and magnet 19 continues until an idle trunk line is reached, at which time the switching relay 22 which has hitherto been short circuited, energizes in series with the relay 20, which latter relay does not energize, and disconnects the relays of the switch D from the line circuit and connects the said line circuit to the wipers and through said wipers to the line relay of the selector repeater E (Fig. 2) to which the connection has been extended.

Line relay 23 energies in series with the extended line circuit-and in turn causes the energization or slow relay 24 which operates to ground the holding circuit back to switches C and D and also to prepare the circuit of the vertical magnet 25 and slow relay 26. Relay 23 is now operated inaccord'ance with the next digit of the called subscribe1-s number and in turn closes the circuit of magnet 25 and relay 26 a number of times, relay 26 remaining energized. dur ing impulses. Magnet operates to step the wipers of theswitch E to a desired level of the banks in which level are located trunk lines leading to the desired branch exchange. As soon as the switch steps otl' normal the springs 27 and 28 come into contact, springs 28 preparing the circuit of release magnet 29 and springs 27 closing a circuit for relay 30 extending from ground through springs 31 and 43, springs 35 and 36, springs 37 and 38, springs 27, and relay 30 to battery. Relay 30, upon energizing, locks itself to ground through springs 39, springs 40 and springs 27 independentof relay 2'6 and also prepares a, circuit for the rotary magnet 41 at springs 42. As soon as relay 26 energizes it will be understood that springs 37 and 38 close contact, springs 31 ant 32 open contact, springs 31, 43 and 44 close contact, and springs 45 close contact and that relay 26 remains energized as long as relay 23 vibrates in response to impulses. The closure of springs 31 and 44 of relay 26 causes relay 46 to energize to open the springs 47. Relay 48 is also energized through its lower winding and springs 31 and 44 at this time, but relays 46 and 48 have no function at this time.

A short time after the impulses for this digit cease relay 26 falls baclr to close the springs 37 and 49 infthe circuit of magnet 41 through springs 42 of relay 30, The circuits of relays 46 and 48 and the initial energizing circuit of relay 3() are opened at springs 31 and 44 and at springs 37 and 38. Magnet 41 operates to step the wipers onto the contactsfof the first trunk line in this level and also opens the holding circuit of relay 30 at springs 40. Relay 30 deenergizes and opens the circuitof magnet 41 at springs 42. Now if this first trunk line is busy aground will be present on the test contact thereof and this ground will pass over the test wiper 54,

relay 30 will therefore not energize again tov operate magnet 41. In this case a circuit is closed extending from ground through springs 31 and 32, springs and 34, relay 55,, to spring 53 where the circuit divides, one path extending by way of interrupter springs 40 on the rotary magnet, through ofli' normal springs 27 and through the winding of the interrupter relay 30 to battery, and the other path extending by way of springs 53 and springs 51 and 50, wiper 54, and through the cut off winding of the line switch (it to battery. The cut off Winding oi the line switch C is energized over this circuit and attracts the cut off armature which maintains the line switch C inoperative. The switching relay is also energized over the above circuit though the interrupter relay 30 does not operate at this time on account of the high resistance of the switchi g relay. The energization of r lay 55has the following results: The opening of springs 52 and 53 and, of 35 and 36, and the closure of springs 52 and 35 opens the circuit of the rotary magnet, connects direct ground through springs 31 and. 32, springs 33 and 34, springs 35 and 52,springs 51 and 50, and to the private wiper to hold the trunk busy and to maintain the cut off-winding of the line switch C energized, as the original energizing circuit of the cut off winding is opened by the operation of the spring 52. The springs 56. open the circuit of the vertical magnet. The springs 57 are adjusted to close prior to the closure of springs 58 which are the last to make contact. Springs 5.? operate to close a point in a bridge across the talking circuit'on the called side of the condensers Which is thereforein series with the line relays of the connector switch H (Fig. 4) and with the trunk line extending through the attendants trunk circuit F (Fig. 3). L traced as follows: from battery through the upper windings of relays 59 and 60 4), springs of relays 61 and 62, conductor 63, springs 64 and 65. of key K, conductor 66, springs 67, springs 57, upper winding of relay 48, relay 68, springs 69 and 70, springs 71 and 72, springs 73 of line relay 23,.sprin s 7 4 and 75, wiper 77, conductor 78, springs 9 and of key K, conductor 81, springs of relays 62 and 61. and lower windings of This circuit may be i relays 60 and 59 in series to ground. Relays 59 and 68 operate over this circuit, relay 60 being differentially wound does not open ate at thistinie. Relay 68 upon energizing, closes springs 82 to hold relay 16 operated, relay 4.6 preventing relays 83 and 8 1 from operating at this time. Relay 18 is an elec tro-polarized relay and its windings in this case have current flowing in such directions as to oppose each other so that the relay does not energize at this time. It will therefore be seen that when the trunk line is seized and relay 55 energizes, the relay ($8 is first to energize to close the circuits of relays 10 and 41-8 before the s 'n'ings of relay 55 close the circuit of relay 83 and the circuit of relay 855 is therefore held open at pprings 41-7. The relay 59 of the connector H held energized in serii-is with the trunk circuit and with relay 08 and operate; to close the circuit of relay 85 which a so operates to prepare the circuit of vertical magnet 86 and slow relay S7 and grounds the release trunk to make the trunk busy at its normals and to light the signal lamp 88 (Fig. 3) to notify the attendant that the switch has been seized, and also operates the visual signal 89 before the operator to show that the trunk isbusy. The circuit of relay 85 eX- tends from ground through resistance 90, (Fig. 2) s )rings of key K, wnductor 9.1, springs 92 and 93. and through relay 85 to battery. This resistance is hi h enou 'h to prevent the magnets of the switch H from operating ate.

When the operator sees thelamp 88 lighted she throws the calling device and listening key K which connects her head set across the cord circuit and also connects the calling device C. D. in series with the dialing conductor 9- 1 which leads to the relay 87 and magnet 86.

As soon as the operator learns the wanted number she operates the calling device Cf fall back D. to interrupt the circuit of ntiagnct S6 and relay 87 a number of times through circuit extending from grourul through springs 95 and 96. dial off normal springs 97, interrupter springs 98. springs 99, dial conductor 9 1. springs of relay which is held energized. elf normal springs 101 and 102, and magnet 86 and relay 8? to battery. lllap net 86 operates to step the wipers to the desired level. relay 87 remains energized duii'ing impulses to hold a new "ircuit for itself and et 86 after the off normal 'a s operate and as soon as impulses c clay RT on falling back prepares circuit for slow relay 103 and rotary magnet 101. 'l i hen the calling device is operated for the next digit the impulses pass from the conductor 91, through springs 100, springs 101 and 105. springs 100 and 107, relay 103, springs 108, springs 109 and. 110,. and magnet 10 1 to but allowsrelay 85 to oper- H .saiue operation occurs until .szcther.

battery. Magnet 10 1 operates over this circuit to step the wipers of the switch H to the contacts in the selected level to which is connected the wanted subscribers line. Relay 103 remains energized during impulses to hold the circuit of relay 111 closed and f0 a short time after impulses cease. Relay 111 opens the springs 108 which are short circuited by the springs of relay 103 during encrgization of relay 103, opens the circuit of relay 112, and prepares a circuit for its own upper winding to the private wipe, 113. Certain of the subscribers lines accessible to this connector are grounded so that if one of the lines are busy the switch will, rotate on to the next line of the groin). The private contacts of single lines and of the last contacts of a group are not connected togethi-ir while all but the last pair ot'privale contacts of a group are connected to;. ;ethe1.' Now if the switch is operated too the first set of contacts of a group and this contact is busy, then ground will be connected to both test wipers 113 and 114-. and relay 111 will. be held energiz zzed. through its upper windin while relay 119 will also be energized from ground on 1' 11 1 through springs 116 of Relay 119 operates to close a holding cir cuit for itself through springs 120 and connects ground through springs of relay 85, through springs 121, springs 109 and 110, and ma lot 104; to battery. Magnet 104; oporal es relay 11 9. If the next trunk is busy the the wipers reach the last contacts of a group which are like a. single line and are not connected toll. this line is busy relay 111 will alone be held energized to give the busv signal but relay 119 will not energize. As soon, as the line becomes idle or if it is idle at at then after an interval relay 111 will and a circuit is completed for the cut on relay 119 which energizes through its upper winding and locks through its lower winding to connect the trunlr through to the wipers and open the circuit-s of the magnets. The called party now signalled by means of the rin ing etniipinent R and when the called party answers the relay 122 is ener gized to cut 05 the ring and to connect the called line to the back bridge relay 61. i i hen relay 61 energizes, the signal lamp 123 at the attendants trunk is lighted to inform the operator that the called'man has answered. Conversation may proceed in the usual manner with the switch H held up by line relay 59 which is energized over two sides of the trunk circuit in series. It may he pointed out that if the operator so des opera .o...

is tan key K may be thrown by the to put direct ground on the sl ltlllgS to step the Wipers to the next set of contacts and opens the circuit of llti ot the line. relayot switch H to permit calls to, be completed by the calling party in the main exchange without the intervention of the. attendant. I

Assuming that the operator has the key K thrown when the selector repeater E, Fig. 2, establishes connection with the trunk line, comprising conductors 66 and 78, the calling subscriber may be operating his calling device in accordance with the two of the number of the desired subscriber in the branch exchange establish his own connection. In response to the operation of the calling devicethe line relay 23 of the selector repeaterv E repeats the impulses over the trunk line to the line relay 59 ot the corn nector H by way of spring 7 It will be remembered that the orig ial energizing circuit of relay 59 was completed by way of spring 73 but that the connector switch H could not be operated by the calling sub scriber the conductor 01 was not connected to ground direct. However, as the conductor 91 is now connected to direct ground the connector. H will operate under the control of its line relay 5?) to complete the de sired connection in the usual manner.

Now let us assume that the branch exchange which is handled through the attendants trunk F 8) is in the office or factory of a concern who also have another private branch exchange located in their warehouse or other branch which is accessible to another level of the selector repeaters E in the main exchange or to other selector repeaters in said. main exchange. Now if the calling party desires to speak to some party who at the time of calling is known to. beat the other branch exchange thenwhen the attendant at E receives the calling partys order for this party or his number I have provided means which I will now explain for enabling the attendant at E to extend the call to the other or another branch exchange from the selector repeater E in the main, exchange without having to inform the calling party to hang up andcall another number. 1

Vben the attendant finds that a party in some other bnanch exchange is wanted she will restore key K and then throw her call out key K which will cause the trunk circuit to pass from conductor 66 through springs 125 of key K springs and 127, through the resistance of the coils in the op erators headset, springs 98 of calling de: vice C. D., springs 129 and 79, springs 130 of key K and conductor 78.

The operation of this key to change the circuit of the bridged relays 68 and 48, only relay v68 of which is energized, causes relay 68.150 fall back to open the circuit of slow Frelay ld'whidi has heretofore prevented relay83 from energizing. As soon as springs 47 of relay close relay 83 energizes and locks energized with the tollowing result,

' the, circuit including the calling device of the attendants clrcult 15 now connected from conductor 66, throughwiper 7 6, springs 131 and 132, springs 57, upper wlndlng otrelay 41-8, relay 68, springs 69 and 70, springs 71 and 13 1-. and conductor 135 to the line switch C. The other side of the circuit extends from conductor 78,,through wiper 77, springs 136, sprin s74l and 137 and to conductor 138 extending to line switch C.

Now as soon as the above traced circuit including the line relay of line switch C, the relays 4-8 and (8 and the springs 98 and 97 pt the calling device is completed theline switch (1 operates to automatically select an :1 .le selector switch such as D (Fig. 1) and as the dial is operated in accordance with the switches shown at D and Now when the wanted subscriber answers the battery w ll be reversed over the extended connection and back over the series circuit including relays 18 and 68 in the selector repeater E 2). then the battery is thusreversed in the upper winding of relay 48, said relay B1161?- gizes due to both its windings assisting each other and acts to close the circuit ofrelay 84:

at springs 1%10, and closes the circuit of reversing relay 141 at springs 1412 and 143. Relay 141 energizes to reverse the battery back to the calling'line.

Relay 84.- locks energized to ground through springs 1 14:, opens the springs 136 in the series circuit extending to the attendants trunk circuit, removes ground from the private wiper 5a to allow the trunk to the private branch to be used for other calls, opens the springs 131 and 132 to complete the cuttingod ot' the trunk to the branch exchange, opens the initial circuit of relays l8 and 68 at springs and 69 and completes a holding bridge for the extended connection which extends from conductor 135 of switch C through springs 183 and 132, springs 57, upper winding of relay 418, relay 68, springs 69 and 145, springs'73, springs 7 1 and 137, and conductor 138.

It will be seen therefore, that the calling subscriber may now converse with the wanted party in the second exchange and that the trunk to the first called exchange attendant is free and may be used for calls to that exchange from some other selector repeater into which it is multipl ed or for calls from the branch exchange to the main exchange, in which case the line switch C is used to complete the call in the main exchange. I have accomplished this result in a very simple manner through the medium of an improved selector repeater E, an attendants trunk circuit which is of a very simple design. consisting of keys and signals without any rela s, and a rotary connector which is adapted for this type of private branch exchange work.

Having described and pointed out the features and aspects of my invention, what I consider to be new and desire to have protected by Letters Patent will be pointed out in the appended claims.

l Vhat I claim as my invention is:

1. In a telephone system, a directively controlled automatic switch, lines accessible thereto, a variable impulse sender common to said lines, anautomatic non-numerical switch individual to said switch, means for operating said first switch to extend a connection to one of said lines, other automatic switches, means controlled over the called line exclusive of the said impulse sender ifor operating said non-numerical switch to extend the connection to one oi? said other automatic switches, and means controlled by said impulse sender for operating the seized automatic switch to extend the connection in the direction of another called line.

2. In a semi-automatic telephone system, an operators trunk circuit, a directively controlled switch for extending a, connection to said circuit, another automatic switch individual to said first switch, a calling device associated with said trunk circuit, operators equipment separate from said calling device for operating said second switch in the direction of a called line, and another switch responsive to said calling device to complete the connection to the called line.

8. In a telephone system, an automatic switch, lines accessible thereto, an automatic non-numerical switch individual to said switch, means for operating said first switch to extend a connection to one of said lines, means controlled by the subscriber on the called line for operating said non-nu merical switch to extend the connection to another called line, and means controlled by the subscriber on the second called line for,

opening the first extended connection.

4L. In a telephone system, an automatic switch, a trunk line accessible to said switch terminating in another automatic switch, operators equipment in said trunk line, means for operating said first switch to seize said trunk line, and signal the operator, and to then operate the other automatic switch to extend the connection to a called line, means controlled by the operator for preventing the operation of said other switch and for connecting a calling device with said trunk line to either operate said other switch directly or to break the connection to said other switchand extend the connection from said first switch to athird automatic switch.

5. In a telephone system, an automatic switch, a trunk line accessible to said switch terminating in another automatic switch, operators equipment in said trunk line, means for operating said first switch to seize said trunk line and signal the operator, and to then operate the other automatic switch to extend the connectionto a called line, means controlled by the operator for preventing the operation of said other switch and for connecting a calling device with said trunlt line to either operate said other switch dircctly or to break the connection to said other switch and extend the connection from said first switch to another automatic switch, and means controlled from said last automatic switch for breaking the connection from said first switch to said trunk line.

.6. In a. telephone system, an automatic switch, trunk lines accessible thereto, another switch associated therewith normally disconnected therefrom, means for operating said ii t switch to seize one of said trunk lines, means controlled by the opening of the conductors (iii the seized trunk line for con uecting said other switch with said first switch and means controlled by the initial closure ol the conductorsojt said trunk line for operating said other switchto extend a connection from the first switch.

7. In a telephone system, an automatic switch, trunk lines'aceessible thereto, another automatic switch associated therewith normally disconnected therefrom, means for operating said first switch to seize one oi said trunk lines, means controlled by the opening of the conductors of the seized trunk line for connecting said other switch with said first switch and means controlled by the initial closure ofthe conductors of said trunk line for operating said other switch to extend a connection from the first switch and excluding said seized trunk line.

8. In a telephone system, an automatic switch, trunk lines accessible thereto, an other switch individual thereto normally disconnected therefrom, means for operating said first switch to seize one of said trunk lines, means controlled by the opening of the conductors of the seized trunk line for connecting said other switch with said first switch and means controlled by the initial closure of the conductors of said trunk line for operating said other switch to extend a connection from the first switch.

9. In a telephone system, an automatic switch, trunk lines accessible thereto, another automatic s'witch.associated. therewith normally disconnected therefrom, means for operating said first switch to automatically trunk s] otheisw, ch vith said iii-sts izitch and means controlled bythe initial closureof the conductors-of said trunk line for operating said other switchtio extend a connection from thefirst,switch. .1 v 1 e 10. In a {telephone -system, an automatic switch, a noi nun e ical switch H individual tl' eret hut n n' nally, disconnected theref rom, trunk lines accessible, to said switches, means for operating said itlltOIiHLtlQ, switch to,;-,seiz e,one;of f said tnu lines, a, callingdevice associated, with said seized trunk line, operations equipment separate from said calL ing deviceassociated with seized trunk line f o ycausingi the connection of said nonnumerical ,and automatic, switches and for Qperating jsai onmumerical switchto ex-, en/dia .Can s.l nstew er ne 10f Said trunlg, lines, and another switch responsive to said calling device to complete the connection to a, called line. 1 I

,ll ln a telephone system,a ti'unkline, an automatic-switch, for eXtending connections from said ti unlg line to anyone of a plurali ty, ,o,otl 1e trunk lines which, a1:e,aecessihle -;to i said switch, ,vanothe automatic switchintlividual tosaid first trunk line, another, :line, means fop ope ating said first switch to extend a, connection-to one ,of said other trunkglines neans controlled over the extended connection and ,said last mentioned trunk line, responsive, to, a single; closure of a meta'lic. circuit laci oss the trunk line for operating said. second ,switch, to automatilly ex e onne t ontt aid o he linev12-7 v' te ep be sy tem, a a ei i switch, alnonrnumerical switch indiyidual ther to bu n mal y di nne ted Hthererai Week;ina ssi le-i0 i ls ihes means for, operating sa d, automatic I switch to seize, .a trunk line, I means controlled, ,over

tl e sei sed trunk line iioizhc onnecting the nonnumei' eal. .to the automatic switch and for end iconnection to anothei one of said I I es, and means controlled over the lastnien oned connectmnfor breaking the connection of said first automatic switch to the seized trunk line.

113 111 telephone, system, an bp'mt rs position, an autoinatic switch, ti'unl; lines accessible to said switch, terminating, in a connector switch, means for causingpsaid automatic :switchl ito select anl idle, one of said tnunklines and; then, repeat impulses over ;it;to; opei ate .said connector switch to lco'mplete .aiconnection to a "called line, means controlledlfi'on s .d ,opeiat'orsf position to p event e. ope t n Said, WQQ f switch, a nonnumenical switch individual to said automatic switch, means controlled fiontthe'said 'opei'at'ors position over the said auto'matic switch to,select an idle one said trunk lines and opei te said sig cal switch qoperate-m extend the 'coniiec ch ine t tion,, a si 'ial thereat, l'liQZtilS i011 m-sting means at the ,operators 'po-si (in to complete the connection to, a called su'bscribers line oi; to operate said individual switch over the selected lt unk to extend the call. toasteond called subscribers line,

15. In a telephone systeiman automatic switch, a nonnuinei'ical auton'iatic switchindividualthereto, trunk 'lines accessible :to said auton' cswitc'lnan opera or a iii final, the eat, means for 'opei'atingfsaid automatic switch to selec tan idle' one trunk lines and'op'elate saidsignal, i'n'eans at the operators position .to co npletethe connection to a'called subsc iberislline ov'e I said trunk line, or to'opei' ateisaid indiv dual switch over the selected tifunk i'toe'iitend the call toa second called subsciibei s'line M v 16. In a teleplionejsystln, an'automatic switch, a iionnumericfal automatic switch individua]; thereto, trunk lines accessible to said automatic switch, anoperat ofs' position, a signal thei-eat, means for operating said automatic switch to select anidle one of said ti-unl; lines and operate; said signal, means t the'operato s position to cem pieteun connection to a called line,- or to operate saidindividual switch, over a circuit including theselected trunk to extend the callto a second called line;

17. In, a telephone system, a subsci ibei s lineQan automatic switch, a :nonnum'ei'ic'a'l switch ndividual thereto, trunk lines accessible to said automatic switch, means tor extending said line to said automaticswitch,

an operators position anda signal the 'eat, means for opei'ating' said automatic switch to select an idle one of said trunk'linesand opeiate said signal, said automatic switch operating thereafterto repeat impulses over I the selected trunkto complete'a connection to a'called line, and n'iean's 'the Opeiato'rs position "for preventing said last named operation and for operating said noni'iiunerical switch overthe selected t'runk'to'complete a connection to a second 'cgaljled line.

1 8,. In a semiautomatictelephone system, an opei'ato1"sjti'unl; circuit, a SWitO h fQIf extending alco'nnection to said trunk circuit, anothe tfswitch associated with said first s wxrit ehpineans cont-tolled the "opeiator at the trunk ci cuit for operating said other switehto exteiid a connectio i to :1 called sub sc 'ibeig; and means coii ti'ollechhy the of said tiunli circuit for opening t i'e fir st e i 1 .w L iv: i sponse of ,thecalle'i subscriber inde endent like ing said non-numerical switch to extend a.

connection to another of said branch exchanges over another one of said trunk lines.

20. In a telephone system, an automatic switch, telephone lines divided into groups accessible thereto, means for operating); said switch vertically in order to select one of said groups and for then rotating said switchinto connection with one of said lines, a test wiper for said switch, a slow acting test relay for said switch, another slow acting re-. lay energized during the rotary movement of said switch, a circuit for said test relay completed by said other relay, and a second circuit for said test relay including said test wiper.

21. In a telephone system, an automatic s vitch, telephone lines accessible thereto divided in groups and Sl,Ll;)-.1L'OU])f53, said switch having a directively cont-rolled. movement to select groups and subgroups and an automatic movement to select an idle line in the selected subgroup, a relayenergized only during the movement of said switch in selecting subgroups, a testwiper for said switch, a slow acting test relay for said switch, a

circuit for said test relay closed by the first mentioned relay, and a locking circuit for said test relay including said test wiper.

In a telephone system, telephone lines, a first exchange and a second exchange, a trunk line interconnecting said exchanges and terminating at said. second exchange in an automatic switch, an automatic switch in said first exchange having access to said trunk line, a non-numerical switch individ ual to the second. mentioned automatic switch, a third exchange, trunk lines atcessible to said non-numerical switch ex tending said third exchange, means con trolled from a calling one of said telephone lines in said first exchange for operating said second switch to seize the first mentioned trunk line, means controlled from said calling line for then operating the first mentioned switch, means then operative controlled over said. first trunk line for operating said non-numerical switch to connect with one of said other trunk lines, and an auton'iatic switch in said third exchange controlled over the connected trunk line to complete the connection to one of said. telephone lines in said third exchange.

accessible to said automatic In a telephone system, telephone lines, a first exchange and a second exchange, a trunk line interconnecting said exchanges and teri'nii'iating at said second exchange in an automatic switch, an automatic switch in said. first exchange having access to said trunk line, a non-numerical switch individual to the second mentioned automatic switch, a third exchange, trunk lines accessible to said non-numerical switch extending to said third exchange, means controlled from a calling one oi. said telephone lines in said first exchange for operating said second s :itch to seize the first mentioned trunk line, means controlled from said calling line for then operating the first mentioned switch, means then operative controlled over said first trunk line for. operating said nonimmerical switch to connect with one of said other trunk lines, an automatic switch in said third exchange controlled over the connected trunk line to complete the connection to one of telephone lines in said third ("ch-tinge, and means for disconnecting said first trunk line from the connection.

2-1. In a telephone system, a first exchange and a second exchange, a trunk line interconnecting said exchanges, a directively controlled automatic switch having access to said trunk line in said first exchange, an automatic non-numerical switch associated with said trunk line in said first exchange, a nonnumerical switch individual to said directively controlled switch, a group of trunk lines accessible to said non-numerical switches. means controlled over the first mentioned trunk line for operating said associated nonnumerical switch to seize a trunk line in said group,means for operating said directively controlled switch to connect with said first trunk line, and means operative when said directively controlled switch is in connection with said first trunk line for preventing the operation of said associated non-numerical switch and for operating said individual non-nun'ierical switch.

25. In a telephone s stem, a first exchange and a second exchange, a trunk line intorconnecting said exchanges, a directively controlled automatic switch having access to said trunk line in said first exchange, an automatic non-numerical switch associated with said trunk line in said first exchange. another automatic non-numerical switch in dividual to said directively controlled switch a group of trunk lines accessible to said nonnumerical switches, said directively controlled switch being operable to connect with the first mentioned trunk line, and means controlled over said first trunk line for operating said associated non-numerical switch to seize-a trunk line in said group or if said directively controlled switch has connected with the said first trunk line for preill Venting the operation of said associated nonnun'ierical switch and for Operating said individual switch to seize a trunk line in said group.

'26. In a telephone system, a first 6X- change and a second exchange, a trunk line interconnecting said exchanges, a directi'vely controlled automatic switch having access to said 'trunk'line in said first exchange, an automatic non-numerical switch associated with said trunk line in said first exchange, another automatic non-numerical switch in dividual to said dii'ect'ivcly controlled sWi-tclna group of trunk lines accessible to said non-numerical switches, said directive- 1y controlled switch being; operable to conmeet with the first mentioned trunk line, means controlled over said first trunk line for operating said associated non-numerical switch 'to seize a trunk "line in said group or if said d'irectively controlled switch has connected With the said 'firsttrunk line for operating said individual non-numericalswitch to seize at'runk linedn said group.

27. In a telephon'e'systeni, an automatic switchgtruirk linesac'c'es'sibleto said switch terminating in *other automatic switches, means for operating 's'aid first mentioned switch to select an idle one of said trunk lines and repeat impulses thcreover to operate a said other switch-to con'iplete-a connection to it called stibsciibeWs line, another switch, "and ineans controlled over the selectswitch associated with said first mentioned ed trunk line for operating said associated switch'to extend a connection to a second called subscribers line before said other switch is operated.

28. In a scl'nianton'iatic telephone s stem-,

a calling line, an operatoi"s trunk circuit, a switch directively controlled from said calling line for extending a connection to said 29. In a telephone system, an autonia' tic switch, trunklines accessible to said switch, means for operating said switch-to se'lect a'n idle one of said trunk lines and to repeat impulses 'ther'eover, another switch associated with said In st switch, means 0011-,

trolled over said selected trunk line foreporating said other SWltClitO'GXteHCliL'CQnnGC ticn from the first switch to af called line, and iucans controlled from the called line exclusive of control over said selected trunk line to break the connection from the first switch to thesele'cted'trun'k line.

Signed by me at New York, N. Y., this 7th day oi March, 1919.

nMrL JAcoBsEN.

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