US1588764A - Telephone system - Google Patents

Description

June 15,1926. 1,588,764

F. LUBBERGER mmrnons SYSTEM Filed March 1'1. 1922 4 Sheet s-Sheet 1 4 Sheets-Sheet 2 June 15 1926.

F. LUBBERGER TELEPHONE SYSTEM Filed March 17. 1922 All 4!.

N w h NAP June 15 1926. 1,588,764

- F. LUBBERGER TELEPHONE SYSTEM Filed larch 1'7. 1922 4 Sheetg-Sheat 4 FEE Lubber EI' :Batented June 15 1926.

PATE

NT oF IcE.

FRITZ LUBBERGER, OF BERLIN-SCHMARQENDORF, GERMANY, ASSIGNOR TO SIEMENS & HALSKE AKTTENGESELLSCHAFT, OF SIEMENSSTADT, NEAR BERLIN, GERMANY.

TELEPHONE SYSTEM.

Application filed March17, 1922, Serial No. 544,616, and in Germany March 18, 1921. v

Circuit arrangements are already known for setting selecting devices used for telephone purposes over long distance lines used for speaking purposes. The construction and maintenance of long lines is however Very expensive. Endeavours are therefore made to use the long distance lines for transmitting various kinds of communications (e. g. telephone, printing telegraph, high frequency telephony, etc.) with the assistance of special circuit combinations. To use such longdistance lines for setting selecting devices for telephone purposes causes difliculties,

According to'the invention these difliculties are overcome in a simple manner by using the means for transmitting telegraph symbols also for setting the selecting devices for telephone traffic over long distance lines. The setting of selecting devices can for instance be eflected with the assistance of an automatic type printing high speed telegraph instrument, which is preferably used for long telephone lines carrying a heavy traffic. This high speed telegraph is described in the periodical Telegraphen und Fernsprechtechnik 1913, Nos. 12, 13, and 14.

The drawing shows diagrammatically several examples of the new circuit arrangement that are based on the above mentioned high speed telegraph.

In Figures 1 to 3 is shown a complete arrangement of the transmitting and receiving devices used for setting the selecting devices. Figure 4 shows a switching arrangement, by means of which, during the maintenance of a speaking connection, the selecting devices for the next connection can be set and this connection can be so far prepared that at the end of the conversation the subscrib ers lines can be connected to the long distance line without loss of time.

In Figure 5 an arrangement is shown which is associated with the long distance operator and is constructed similar to the transmitter of a high speed telegraph; this arrangement enables the long distance operator herself, without the assistance of the telegraph operator, to transmit the number impulses necessary for setting the selecting devices.

In the circuit arrangement shown in Figures 1 to 3 two long distance exchanges A and B are shown connected together by a trunk line FL. The setting of the selecting devices for long distance calls is accom plished in the following manner: It is assumed that a subscriber of the local exchange belonging to the long distance exchange A desires to speak to a subscriber of the local exchange belonging to the long distance exchange B. The record operator in the exchange A takes a note of the c'. 1 and hands it on to the required long distance position. At the same time, therecord operator gives the required subscribers number to the telegraph operator in the telegraph instrument room at the exchange A. The telegraph operator perforates a strip according to the number of the wanted subscriber. The long distance operator is connected'with the telegraph operator by means of an order wire or any other desired signalling arrangement; if no long distance call is yet set up she verbally gives the telegraph operator, over an order wire or other signalling arrangement, instructions to set up the number of the wanted subscriber. The telegraph operator in exchange A inserts the perforated strip into the sender, whereupon current impulses for setting the selecting devices are transmitted. The long distance operator completes the connection by inserting the calling plug into the long distance jack. If the telegraph operator happens to be sending a telegram, he interrupts the telegram and first transmits the number. The telegraph operator in the other exchange B recognizes,-by the calling signal for setting the selecting devices, that the following number does not belong to the telegram, and cuts out this number. As soon as the number has been transmitted, the transmitting telegraph operator in the exchange A again inserts the telegraph strip (a few letters being taken back) and. the further transmission of the telegram takes place.

For preparing the representation of the number impulses for setting the selecting devices a certain key of the key set belong ing to the high speed telegraph is used at tomat-ic transmitter GB. It is assumed that the subscriber No.26? 9 of the exchange B is wanted. The preparatory or calling signal is transmitted corresponding to the first row of holes in the perforated strip (5 holes in the strip equal five number impulses). Thereby the following circuit is established: The contacts H H H H and H connect in succession the contacts ,K to K of the slip ring S to the positive pole of the battery B whereby the rotation of the brush Bu over the slip ring S repeatedly closes the circuit for the polarized relay X. The relay X responding to the five impulses, operates five times in quick succession and sends, by closing its contact m five positive current impulses over the long distance line FL connected, for simultaneously telegraphing: earth, battery 13,, contact w, winding I of the repeater U61, winding II of Ue connected in arallel, a and 6 leads of the trunk line F connected in parallel winding I of the repeater Ue in the exchange B, windin II of U62 connected in parallel, polarized line relay X earth. The polarized line relay X connects its armature m, to the positive pole of the battery B five times, so that by the rotation of the brushes B24 to Bu of the receiver ER, which rotate simultaneously with the transmitting brush Bu the five polarized relays R to R are in succession energized, since they are connected to the live contacts of the receiver ring S earth, battery, 13,, contact 10 R or R and so on, contact 1 or 2 etc., of the receiving ring S contact brushes Bu and Bu slip ring 3,, earth. The relays R, to R move their contact arms into the position 1' 1' r 7' and 0",, (the first number behind each r corresponds to the corresponding relay R R etc.).

Durin the rotation of the brushes Bu to Bu the relays R to R serve for starting the signal to be repeated. During the succeeding rotation of the brushes this signal, in the manner described below, is repeated to the repeater rings S to S At the same time, with the assistance of a second set of relays R to R which corre spond to the relay set R, to R a new signal is started, which during the succeeding rotation of the brushes is repeated to repeater rings S to S, by means of contact arms,

of this rela set. The relay set R to R and R1" to are alternately connected to the receiver ring S Both these relay sets thereupon interchange their functions at each rotation of the brushes. While during one rotation one relay set receives a new character from the long distance line, the other relay set translates the character it received during the preceding rotation.

As'above explained, the relays R, to R were so energized during one rotation of the brushes Bu to Bu that their contact arms were brought into position 73,, 1' r 1' and T At the beginning of the succeeding rotation of the brushes, the relays R, 80 to R are disconnected from the receiver ring 8,, by the arrangement shown. On this rotation as soon as the brushes Bu to Bu reach a position, in which contact 8 corresponds to the repeater ring S2, the fol-' lowing circuitis closed: earth, slip ring 5,, brushes 1314,, Bug, cont-act 1 of slip ring 8,, contact 7-,, of R contact 1' of R contact 1 of slip ring S brushes B10 B10 contact 2 of slip ring S contact 1",, of R contact T of R contact 4 of slip ring S brushes Bu Bu contact 8 of slip ring S winding I of the starting relay An, battery, earth. The starting relay An operates and locks itself over contact an in the operating circuit: earth, battery, (m U winding II of An, earth. By the energizing of the starting relay An the operation of a translator UR is prepared by the setting of the selecting devices; this translator is provided with a group of relays RG73 (Fig. 2), a stepping switch (setting switch or the like) SW, a group of relays RG13, (Fig. 3) and a number sender ZQr. Simultaneously with the relay An, the 105 printing magnet DrM is energized over r so that the calling signal also appears printed on the paperstrip, and the telegraph operator recognizes, that the following four characters (the number of the characters de- 1 0 pend on the size of the automatic exchange) do not belong to the telegram.

The brushes have moved over the slip rings S to S and have run to the dotted position. Now the rotary magnet SM of 115 the stepping switch Sl'V is energized as follows: earth slip ring S, brushes B11 Bu contact 3 of the slip ring S starting magnet St-M contact wo, switch arm wa of the switch contact U of the relay U contact 120 (m of relay An battery, earth.

The switch arm lVa is set in the first contact 10, whereby a circuit is closed for the relay U earth, winding U contact 10, and switch arm 20a of the stepping switch, con- 125 tact @1 cm battery earth. The relay U is energized and closes its contacts u u a and u to 14 (Fig. 3), thereby a circuit 1s prepared for the relay e. g. Z of the relay group RGTH of the translator UR, by

ing to the number 2. This signal cor-- responds to the hole in the second row of holes of the transmitter strip. The transmitter brush Bu generates a negative current impulse when it moves over contact K by moving over the contact K it generates positive current and by moving over the contacts K, to K, it generates again negative currents. The positive current holds at the receiver ER the relay R in the.

position 1' while the negative currents cause the relays R and R to R to return to the position r 9' T and r The relay An (Fig. 2)'by its operation closes the contacts an an (m (m and (m The relay R furthermore has closed its contact On the next rotation of the brushes relay N is therefore energized asfollows: earth, slip ring S brushes Bu Bu contact 1 of the slip ring S contactr contact (m winding I of the relay N battery, earth. The relay N locks itself over its contact a in the following circuit: earth. battery winding II of N contact 12. contact SII earth, and moves its armature so that the contact 12 and n are closed. The punching magnet STA is energized at the same time as the relay N This magnet can be used for making a corresponding strip of holes at the receiver of the installation.

'hen on further rotation the brushes reach the dotted position the following circuit is established :Earth, slip ring S brushes B11 Bu contact 3 of the slip ring S winding of the switching magnet StM, contact a (Fig. 3) of N operated contact a of N contact a of N winding I of relay Z contact M12 of a battery earth. The relay Z locks itself over its contact 2, in the holding circuit: earth, battery, winding II of Z 2 slip ring Sch, and contact arm of the number sender ZG earth; it connects over its contact 2 earth to the second contact of the thousand group of the selecting device Sch of the number sender ZG. Simultaneously with Z the switch magnet StM (Fig. 2) of the stepping switch is operated as soon as the brush Bu leaves the contact 3 of the ring S,, the switch magnet StM is de-energized so that its contact arm Va is moved on to the second contact IV,- WVhen the armature has I been fully attracted the switch magnet StM opens its contact St whereby the holding circuit of relay N is opened and this relay is de-energized. All the N relays have and now returned to their normal position. Over the corresponding contacts ofthe translator, slip rings S to S a circuit over the printing magnet DrM is closed so that the selected number is printed on the paperslip of the telegraph operator.

On the further movement of the stepping switch SV on to the second contact w, the relay I], is de -energized and the relay U connected up. The relay U opens its contacts a,, to u (Fig. 3) whereby the receiving relays Z to Z are disconnected for the lirst train of impulses. The relay U by closing its contacts @4 to a has connected up the receiving relays Z to Z for the second train of impulses. The impulses for the second contact of the wanted subscribers number are repeated in the same manner. \Vhen the last (for instance 4th) train of impulses is transmitted the relay U is ener ized and closes its contacts u t contact a 1 lay a is energized. The relay U has opened its contact u Since the relay U locks itself over its contact U45, it only releases after the switching magnet StM has set the contact arm l/Va of the stepping switch onto the fifth contact w, at the end of the impulse transmission (the fourth train). In this position the stepping switch in known manner automatically releases itself electrically or mechanically. The relay U. quickly releases and opens its contacts 11. U46, whereby the relays An and U are caused to release. Since the relay U is slow acting; it releases aftera fixed delay and closes its cont-act n so that in the meantime the relay An is reliably deenorgized and has opened its contacts an, to The high speed telegraph is now again free for the reception of telegrams.

By the energization of relay U the circuit, for the coupling magnet KM of the sender ZG was closed over contact 4,, .(Fig. 3) earth, u winding of the coupling magnet KM, battery, earth. This magnet causes the sender ZG to operate. As soon as the coupling magnet KM has moved the switch arm cating the trains of impulses that are to be generated by the impulse transmitter of the number sender. lVhen the switch arm of the contact row Sch reaches the last contact. the locking circuit. for these relays is opened, so

the slow acting remakes one further step and thus likewise reaches the normal position.

l The circuit arrangement shown in Figure 4 represents diagrammatically how the befor'c described installation, by means of which the wanted subscribefis number is transferred tothe register by means of the telegraph, is connected with a telephone system at the receiving sideofthe whole installation. The arrangement shown in Fig.

4 has the special advantage that while a speaking connection is maintained the selecting devices for the next connectioii can be operated, so that there is no loss of time between succeeding calls (during the setting:

of-the selecting devices, answering the call etc). The method of operating the arrangement according to Figure 4 is as follows:

It is assumed that the subscriber T of the A exchange is connected with a subscriber T of the automatic exchange B over the long distance line FL. The next connection to be set up is assumed to be a similar one, for instance between the subscriber T of'the exchange A with a subscriber T of the automatic exchange B. .l)uring the setting up of the connection between the subscriber T and T battery .B was so connected to the long distance line FL, by means of a switch MS located in the cord circuit SZP' of the long distance operator, over the plug Fbz, which has been inserted into the long distance jack FK of the cord circuit StP, that the positive pole is connected to the a-lcad and the negative pole to the b-lead, whereby a polarized relay M in the long distance exchange B was so energized that the contacts 1 2 and 3 of this relay were closed. ()ver contacts 1 and 2,, the long distance line FL is connected with a connection-ineans-ofaccess VL leading to the first selector LGlV and over the selectors LGW', ILGYV a connector LW is connected with the subscriber T,. At contact 3 the circuit is closed for relays R and V. As soon as relay R is en crgized the relay G is connected up over contact 4.. The relay G at its contact S has connected the impulse transmitter Sch, (Figs. 3 and 4) of the sender ZG to a sec ond (free) junction line which likewise leads to a first selector LGW.

The long distance operator at A now wishes to prepare the connection with the subscriber T of the exchange B. She sets the number sender ZG in the manner before described by means of the high speed tele graph. in order to render the drawing clearer the parts Sch to Sch already shown in Figure 3 have been omitted from Figure 4. As soon as the number sender has received the last train of impulses it starts to operate automatically and over its impulse sender Sch,, transmits the first train of impulses; earth 6,, contact row of the Impulse sender Sak 5 7 1, rela A battery, earth.

The relay-A repeats t e number impulses to the switching magnet of the first selector LGW, so that it is set in known manner. The test magnet P of the first selector LGl/V operates over earth, winding I of P 0 wiper and contact of the selector resist'ance 'w battery, earth, and connects itself in the holding circuit over its contact 8, and the'winding II. At contacts 9, and 10 the test relay P, connects the line through to thesecond selector ILGW.

If an impulse sender Sch now transmits the second row of impulses, the relay A, repeats the impulses to the switching magnet of the second selector ILGW. This is accordingly set. The test relay P operates, locks itself over winding 11 and connects therline through at the contacts 11 and 12,}. The next two trains'of impulses op erate the connector LW. The test relay P effects the switching over or switching through, but the connection at present is still open at the switch contacts 13 and 14 of the polarized relay M, associated with the long distance line, set up to subscriber T'.,. If the number sender ZG has transmitted the last train of impulses it finds itself again in normal position.

011 the completion of the conversation between the snbscribers T and T the connection is set up over the cord circuit StP by the long distance operator with whom the subscriber T was connected over the local exchange that is associated with the long distance exchange A, but which is for the sake of clearness not shown. The long distance operator A, by means of the key M8 so connects battery to the long distance line that the negative pole of battery B is now connected to the a-lead and the positive pole to the b-lead, hence the polarized relay M, associated with the long distance line at the exchange B, is operated, thus opening its contacts 1, 2 and 3 and closing 13 14 and 15 At contacts 13 and 14,, the long distance line FL is connected with the trunk line VL giving access over the selecting devices LGlV, lLGVV and Ll/V to the sub scriber T Over contact 15 the circuit for relays R and V are closed. The relay R on operating closes its contacts 16,, 17, and 18,. By closing contact 17. a circuit for the ringing relay Lt is closed, so that the relay Lt connects up every 10 seconds over a 10-second switch SK and at its contacts 19 and 20,, connects ringer generator to the subscribers line. Thereby the subscriber T is called.

WVhen the subscriber T answers, the relay Y, located in the speaking circuit, is operated over: earth, battery, choke coil Dr, a-lead of the trunk line LGVV, ILGW' LlV, b-lead of the subscribers line Ll/V; ILGW, IGW, b-lead of the trunk line,

Y, earth. The relay Y closes its contacts 21, and 22,-. At contact 21, a circuit for the cut-ofi' relay Ab is closedand at 22, a circuit for the damped relay U is closed. The relay AZ) connects itself over contact in a holding circuit: earth, battery, AZ), 28 18,, earth and at contact 25 disconnects the circuit for relay Lt, so that the generator for calling the subscriber is disconnected. Relay U by closing its contacts 26., and 27 has prepared a circuit for the clearing signal.

The subscribers T, and T. are now connected and conversation can proceed. At the end of the conversation both subscribers hang up. The subscriber T gives the clearing signal direct to the exchange A. The means for giving this signal are known 'and are therefore not shown in the drawing. By hanging up the receiver" at station '1, the relay Y is de-energized. 1t releases and closes the contacts 23, and 24, whereby the following circuit is established; battery 26 23,, 13,,,, repeater Ue, winding I, relay Q, repeater Ue, winding 11, 14 24,, 27 battery. The relay Q operates, connects ring ing current over 29,, and 30 to the long distance line FL so that the clearing signal SZ in the cord circuits StP in exchange A is operated. By the release of Y, U was also de-energized, because Y has opened its contact 22,. Since relay U is slow acting it opens its contacts some time after the release of the relay Y. The contacts 26., and 27,, remain closed for a little while, so that the relay Q is energized and only again released after a little While. The trunk operator at A has received the clearing signal. She cuts in in the usual manner and then releases the connection with the local subscriber T by withdrawing the plug and releases the connection with the subscriber in the distant automatic exchange by connecting up battery B at the key MS Thus the positive and negative poles of the battery B are again connected to the a and b, leads, respectively, of the trunk line FL. Hence the polarized relay M again operates its contacts, openings 13 14 15 and closing 1 2 3 By opening the contact 15... the relays R and V are released. The relay R opens its contacts 16,, 17., 18,. Hence at contacts 17 and 18, the relays Lt and ab are disconnected, while at contact 16,, the test circuit for the automatic connection is released. I

Since relays R and V were not energized during the connection of subscriber T with subscriber T the relay G was likewise deenergized. Hence the impulse sender Sch of the number sender was at contact 31 connected to a free line tothe first selector LGW so that already during the conversation between T and T -a new connection could be prepared. For this purpose, the

selecting devices were set in the manner already described.

\Vit l pro-announced long distance calls, the wanted subscriber is reached as soon as the connection-is set up, so as to use the long distance lines to the maximum extent, it is preferable that the call for notifying the wanted subscriber should not be sent over the line FL-by the long distance oper ator at the calling exchange A, but the wanted subscriber should have the coming conversation notified by a special long distance operator in the wanted long distance exchange B. The call can for. instance be ell'ected as follows The calls arriving at the long distance exchange A are announced to the operator at B, in the order of their arrival, in the shape of a. telegram (subscribers number and name) by means of high speed telegraph instrument. The operator at 13 noted in succession the wanted subscribers numbers (with corresponding ren'iarks). Assuming that cohversation is taking place over the long distance line FL, trunk line VL and the selecting devices LGl/V, ILGW and L\V, the, as described, the devices LGW and ILGXV and LW for preparing the next connection are set. As soon as the contact arm Z7" of the number sender ZG reaches the last contact 29, the relay H is energized as follows: earth, contact arm Z-r contact 29, contact 30 31, re lay H, battery, earth. The relay H connects itself over its contact 32 in a holding circuit. -On operating, the relay H lights the lamp ML connected in parallel. Thereby the operator recognizes that a new connection is prepared and calls the subscriber, e. g. T by throwing in to the speaking position the key AH associated with a trunk line VL At contact 83 of the key a circuitis closed for the ringing relay LT, earth 83, Lt, 25. lO-second switch SK, battery, earth. The relay Lt is energized every 10- seconds and sends ringing current over its contacts 19 and 20 to the subscriber. Furthermore by throwing the listening key AH into the speaking position at contact 31, the circuit for relay H and lamp ML is opened, whereby the relay H isde-energized and the lamp ML isextinguished. As soon as the subscriber answers, relay Y is energized by speech current. Thereby its contact 21, is closed, so that the relay AZ) is energized. The relay A5 at contact 25, disconnects the relay Lt, thus ringing ceases. T 1e operator now informs the subscriber that he will be called by the trunk exchange in a few minutes. If the wanted subscriber cannot be reached, the trunk call must be deferred. The operator at B notifies this to the operator at A by means of the high speed telegraph.

If itis to be made possible for the 0perator at exchange A to send the impulses (signals) for setting the selecting devices without the assistance of the telegraphist at the high speed telegraph transmitter, her sender is arranged as shown in Fig. 5. Tu this arrangement a key set is provided which resembles the transmitting key set of the high speed telegraph and has 10 number keys T to T and Ta and a key AnT. For the sake of clearness the drawing only shows the keys T T Ta and Anl. By depress-- ing key Ta the transmission of nnpulses for connecting up the register UR (F1gs.-2 and 3) at the distant exchange B is started. W th the sending arrangement accordmg to Fig. 5 moreover a stepping switch SW is provided, which has 12 contacts rows, K1 to V and K to V located in pairs opposite each other. Each contact row has 10 contacts. The contact rows K to V are provided with five groups C to C of five condensers. The condensers 1 to 5 of each group C1 to U are so connected in multiple with the ten contacts of the corresponding rows of contacts K to V that the same condenser 1s connected at contacts 1 and 6, 2 and 7, 3 and 8, 4 and 9 and 5 and 10.

Since each signal comprises a combinatlon of five positive or negative impulses 1n a definite order, there are fitted below the keys Tm, T etc., five groups of three metal rails Sa Sw m, Sm, etc., perpendicular to the swinging direction of the keys, one of the outer of these rails, e. g. Sn of each group is connected to the positive pole of the battery B and the other outer rail, e. g. Sp of each group is connected with the negatiye pole of battery B while the middle rails Sal Sn etc., are connected to contacts of the stepping switch Sl/V For the sake of clearness, the rails Sa Sa Sn, etc., are shown located in the plane of the paper, although they actually run at right angles to the plane of the paper on the assumption that the keys Ta, T etc., swing parallel to the plane of the paper. At the under side of the keys, the contact pieces K K are pivotally fixed and connect the positive pole of the battery 18 or the negative pole of. battery B with the corresponding middle rail e. g., Sa on the depression of each key corresponding to the number of the key, thus combinations of positive and negative currents corresponding to the numher, are generated.

-The stepping switch SW is so arranged that by closing the loop arm RMa, RM etc.,

the similarly numbered contacts 1, 2, 3 etc.,

of the contact rows K K and K K etc., located opposite each other are-bridged in succession.

It is assumed that the operator at the ex-.

for the key Ta. This key corresponds to the preparatory or calling signal, the current combination of which at the distant exchange B efi'ects the connecting up of the register UR (Fig. 2). The contact pieces of the key-Ta connect the positive pole of the battery, with the middle rails Su Sa etc., since the switch arms RM RM etc., of thestepping switch SW normally rests on the contacts are connected over the contacts 1 of the contact rows K V and K to V with the condensers 1 of the groups C to C However at the next movement the switch arms RMa etc., of the switch SW move into position 2, since the rotary magnet was energized over contact 70 closed by the depressing of the key Ta; earth, -contact 70, of key Ta, winding of rotary magnet DM, battery, earth. The switch arms RMa, RM etc., for the present remain in position 2.

If new the key T is depressed, the middle rails Sn are by the contact pieces 70,, to 70, connected with the positive pole of battery B or with the negative pole of battery B The condensers 2 of the groups C1Cv are now, over contacts 2 of the contact rows K to V or K to V of the switch and over the middle rails Sa Sn etc., connected to the batteries and correspondingly receive a positive or negative charge. Over contact 70 of key T the rotary magnet DM again receives an impulse, so that it moves the wipers RMa, RM etc., into position 8. On depressing the keys corresponding to the numbers 4,7 and 5 the third, fourth and eight condensers of the groups C; to C were charged. The wipers RMa, RM etc., are now brought into position 6.

The operator having a set-the wanted number now depresses a key AnT, whereby a starting relay An, is energized as will now be explained.

The sender GB according to Figure 5 is provided, in addition to the usual ring S for sending signals to thedistant exchanges, with two contact rings S S 'over which run the brushes Bu Bu that are coupled to the brush Bu The rings S S are provided with a long contact 37 and 38 respectively and a short contact 39 and 40 respectively. These contacts are so arranged that the brushes Bu Bu run over the contacts 37, 38 during the time in which the brush Bu, in succession comes in contact with the contacts K, to K As soon as the brush Bu has left the contact K the brushes Bu Bu come in contact with the contacts 39, 40

As soon as the brushes Bui Bu run onto the contacts 89, 40 the circuit for the starting relay An, is closed as folows if the before mentioned key AnT is depressed: earth, contact 13 of AnT, contact 39, brushes Bu Bu contact 40 winding of relay An bat- 'tery, earth.

.densers The relay An, operates and locks itself over it contacts 38 earth, contact (5 of the row K wiper l-lMa, contact 6 of K 38 An battery, earth. The relay An, furthermore closes the contacts 31 to 35..., as well as the contacts 36, and 37 and opens the contact 41, to 45 By opening the contacts 41..., to 45 the test1ng levers, operating in conjunction with the perforated strip, are disconnected. At con tact 37 the circuit for the coupling and disconnecting magnet AKM is closed as well as for the switching relay 1; whereby the paper strip at the sender is stopped and thus the transmission of the telegram is interrupted. Over the contacts 31 to 35, the contacts (5l0 ot' the contact rows K to K of the stepping switch SW are connected to the ring S, of the high speed telegraph transmitter, so that on the further operation of thisstepping switch the first, second, etc.,.

condensers of the group C to C discharge themselves in succession over the brush Bu corresponding contacts K K etc., and the line relay L This line relay therefore operates its contacts 121, and 131 (Fig. 1) corresponding to the positive or negative discharge of the condensers, so that corresponding current combinations (positive and negative impulses) are transferred over the long distance line FL to the receiver ER (Fig. 2) in the distant exchange.

As soon as, at each rotation of the brushes, the brushes Bu Bu run ,on the contacts 37, 38, the rotary magnet DM of the stepping switch SW is energized as fol-- lows: earth, contact 37, brushes Bu Bu contact 38, contact 36, DM, battery, earth. By each operation of the rotary magnet DM the arms RMa, RM etc. are moved on one step. As soon as the switch arms RMa, RM, etc., have made a complete rotation; that is from the tenth row again onto the first contact, earth potential is withdrawn from the relay Am. The relay An, opens 1ts contacts. By opening its contact 36 the circuit of the magnet DM is opened. The stepping switch SWV is again in its normal posi tron. By closing the contacts 41, to 45 the hunting device for the perforated strip is again connected up, while by opening the contact 37 the coupling magnet AKM and the switching relay P are again disconnected. Thereby the coupling for the perforated strip is moved in, so that the perforated strip is moved on and the telegram is transmitted.

I claim:

1. In a code sender, a plurality of condensers, means for charging said condensers, means for successively discharging said conover a line circuit after they are all charged to transmit a series of code inlsets, there being one set for pulses and a wiper forming part of said charging means and forming also a part of said discharging means.

2. In a code sender for transmitting numbers, a plurality of condensers arranged in each digit of a number to be transmitted, means for charging the condensers of each set according to a code representing a particular digit, means for associating each set with a line circuit in turn, one set after the other, means for discharging the condensers of each set over the line circuit in succession to transmit sets of code impulses, and a set of wipers forming a part of the said charging means and forming also a part of said discharging means.

3. In a telephone system, a toll line connecting two exchanges, a toll operators switchboard in each exchange, automatic switches in the second exchange controlled over said toll line by the o'peratoi' in the first exchange to connect with a called line, means for autmnatically signalling the operator in the second exchange responsive to the establishment of the connection, and means controlled by the said last mentioned operator for signalling the subscriber on the connected called line.

4. In a telephone system, a toll line connecting two exchanges, a toll operators switchboard in the first exchange, automatic switches in the second exchange, means whereby the operator at said switchboard can control a train of said switches over said toll line to establish a talking connection over the toll line between subscribers in said exchanges, means whereby said operator can control a second train of said switches over said toll line to prepare a second connection while the conversation is in progress, and means in the second exchange controlled by said operator for switching the toll line from the first train of switches to the second to complete the prepared connection when the first is finished- 5. In a telephone system, a toll line connecting two exchanges, a toll operators switchboard in the first exchange, automatic switches in the second exchange, means whereby the operator at said switchboard can control atrain of said switches over said toll line to establish a talking connection said toll line to advise the toll operator when each called subscriber hangs up.

(i. In a combined telephone and telegraph system, a circuit, means for transn'iitting sets of code impulses over said circuit, each set corresponding toa letter or figure of a telegram orto -a. digit in a. telephone number, the digits in each teleplnme number being preceded by a. special set of code impulses, a printing telegraph for printing all letters and figures received, and a telephone number decoder responsive to said special code whenever it is received for decoding the number immediately following.

7. In a combined telephone and telegraph system, a circuit, means for transmitting sets of code impulses over said circuit, each set corresponding to a letter or figure ot' a telegram or to a digit in a telephone number, means for decoding and printing all characters received, means for decoding and registering the telephone numbers, and means for transmitting a special set of code impulses just ahead of each telephone number to indicate a. pause in the telegram being transmitted and to stait the operation of the telephone number decoding means.

8. In a telephone system, two exchanges, means for connecting a calling line in one exchange with a called line in another exchange comprising a. trunk line connecting said exchanges and a train of automatic switches in the second exchange for connecting with the called line, means in the first exchange for translating the called number into a non-decimal code, means for transmitting impulses over said trunk line in accordance wtih said code, a translator at the second exchange responsive to said i1nulses for decoding the number, and a sender 111 the second exchange for operating said switches in accordance with the number after it is decoded.

9. In a combined telephone and telegraph system, a telephone line having a telegraph circuit superimposed thereon, a telegraph sender for sending telegraph messages over said line, telegraph receiving apparatus on the distant end of said line responsive to the operation of said sender, operator controlled means for temporarily removing said telegraph circuit from under the controloi said telegraph sender and for transmitting impulses representing a telephone number over said line, and automatic switchingmechanism on the distant end of said line non-responsive to said telegraph sender, but responsive to said operator controlled mechanism to extend a connection from said line to a desired called line.

10.111 a combined telephone and telegraph system, a line, means for transmitting current impulses over said line representing telegraph messages and for trans mitting similar impulses representing te1eplume numbers, telegraph receiving apparatus on the distant end of the line responsive to all of said impulses, and automatic switchingmechanism also on the distant end of the line responsive only to the impulses representing telephone numbers.

11. in a combined telephone and telegraph system. a line, means for transmitting current impulses over said line, a telegraph recording device for controlling said means, and a telephone-numlier recording device also "for controlling said means.

12. in a combined telephone and telegraph system, a line, means for sending current impulses over said line, a telegraph recording device for controlling said sending means, a telephone-number recording device tor controlling said sending means, and means responsive to the setting of said telephone-mu'nbcr recording device for removing said sending means from under the control of said telegraph recording device and for placing it under the control oi said telephone-number recording device.

12}. In a combined telephone and telegraph systcm, a line, means for sending current impulses over said line, a telegraph rccording device for controlling said sending means, a telephone-number recording device for controlling said sending means, and means for removing said sending means from under the control of said telegraph rccording device and for placing it under the control of said telephone-number recording device.

ll. in a combined telephone and telegraph system, a line, means for sending current impulses over said line. a telegraph recordii'ig device for controlling said sending means, a telephone-number recording device for coi'itrolling said sending means, means for removing said sending means from under the control of said telegraph recording device and for placing it under the control oi said tcleplione-nun'ibcr recording device, and means for rendering the lastnamed means etiective responsive to the arrival of said sending means in a given posi tion.

15.1 1 a combined telephone and tele graph system, a line, means for sending series of current impulses over said line, each series representing a separate character, a telegraph recording device for con-- trolling said sending means, a telephonenumber recording device for controlling said sending means, means for removing said sending means from under the control of said telegraph recording device for placing it under the control of said telephone number recording device, and means torrendering the last'named means effective rcsponsive, to the completion of the transmission of any partially transmitted character.

16. In a combined telephone and telegraph system, a line, means for sending current impulses over said line, a telegraph recording device for controlling said sending means, a telephone-number of recording device for controlling said sending means, means for removing said sending means from under the control of said telegraph recording device and for placing it under the control of said telephone-number recording device, and means for delaying the action 10 of the last named means until the sending means arrives in a predetermined position.

FRITZ LUBBERGER.

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