US1883680A - Automatic telephone system - Google Patents

Description

Ocvt.`jl8, 1932. H. M. FRIENDLY 1,883,680'

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H. M. FRIENDLY AUTOMATIC TELEPHONE .SYSTEM yFiled Ilay 14, .1930 2 Sheets-Sheet 2 MUTUI@ Incaming' End SEI- '1 \F'i|g E'. l

,Elma

T5 I s: l l 543431 EPDM- E 1 T4 75;' I Y 43351 Inc'am" 51111511911117 srd'sez- 3rd Sel 14341 Invennrf mensa oa. 18, 1932 UNITED ,STATI-:sl

HERBERT M. rnIENnLY, or CHICAGO, ILLINOIS;

REPUBLIC BANK AND TRUST COMPANY,

FRIENDLY, DECEASIEU) MILTON B. FRIENDLY AND CENTRAL EXECUTORS F SAID VHERBERT M.

AUTOMATIC TnLnrnONn enterrarl Application med May 14, 1980. Serial No. 452,288.

The object of the present invention is to provide a first numerical switch of the Strowger general class that when u sed as a rst numerical switch of a five-digit multloiice telephone system, will operateA its vertical magnet responsive to the first digit series of a tele hone number tributary to a remote office o the system to selec-t an interoice trunk level and a trunk thereof leading to an incoming second selector, located then 1n the remote oiice. Further, when the said switchv is alternatively operated in accordance with the first digit of a telephone number tributary to the Oiiice containing said switch, the wipers- Of the switch will b e caused to restore to the normal resting position, disabling the vertical magnet for the time being. The rotary magnet is not capacitated to operate unlessthe shaft 1s first operated in accordance with the mter-oliice trunk level, or has been restored as mentioned.

ln the event that the shaft is restored responsive to the rst digit, indicative that the call is directed to a. telephone number tributary to the oice containin the said switch, the second digit will then irectively rotate the shaft so that the talking wipers carried thereby will sweep bank terminals of the level aligned with the wipers when in their normal resting position. This latter level will be referred to as the normal level of said switch. If the second digit corresponds to the second digit of the numbers tributary to the oiiice containing the said switch, or the originating ohce, as it will be e referred to, when the wipers stop on a bank terminal set Of the normal level positioned in accordance with the second digit of the telephone numbers of the originating oce the shaft will again restore to the normal resting position; this time capacitating the vertical magnet for next Operating directively responsive to the third digit series sent by the calling party. The third digit series will serve to cause the wipers of the said switch to align with and select on the level leading to the connectors of'the originating oice.l The last two di its will then cause the connector to select t e called line.

From the foregoing, it will-appear that in calls to telephone lines tributary to remote oilces, four switches, the selector A of the present invention, a second selector as B or D, a third selector as C or E, and a connector 55 as H and I, will be employed, while for calls to telephone lines tributary to the originating oiice only two switches will be employed, the selector A of the present invention, and a connector as F or G, will be employed.

In the event that the second digit is not one that is pertinent to the originating office, wherein the first digit was pertinent to the originating oilice, the first numerical switch (A) will be disabled from thereafter Operating its wipers until the calling party abandons the call by replacing his yreceiver on the switchhook. Under the latter condition of disabling the operation of the wi ers, a tone from source M will be applied audible to the calling party to apprise him of thev condition, so that he will abandon the call which he improperly made.

Drawings With reference to the accompanying drawings Fig. 1 shows the first numerical switch A of the present invention. v f

Fig. 2, which attaches on the right of Fig. 89 l, so that the lines extending to the margins register, shows the arrangement of switches succeeding the switch A in exemplary connections to called telephone lines.

yEquipment The telephones T, T2,.T3, T4 and TE are of any suitable-well known or other type of automatic telephone as used in so-termed twowire Strowger Operation. o@

The line switch LS may be any suitable type of line switch as used in Strowger operation. Thus it may be of the so-called Keith plunger class, or so-called rotary class, or it may be a so-called iinder switch.

The first numerical switch or selector A is of the well known general .class sometimes called a Powell selector, such as is illustrated in Fig. 63 of the Fourth edition of Hersheys book Automatic Telephone Practice, howloo book.-

The repeaters R and S may be the one shown in Fig. 7 5 in th@ said Hershey book.

It will appear presentlythat the first selector A will operate as a first selector and also as a third selector. That is, it will seize a second selector as B or D responsive to the iirst digit Vof a telephone number, or will not seize until the third digit is sent, when .of the system; that is,

it will seize a connector as F or G. The present invention is thus directed to a novel switch A and to the trunking arrangement incorporating the said switch A into a multi-oilice telephone system. However, the switch A has uses in single oliice systems, as

will appear presently.

` Operation When the calling party at telephone T removes his receiver from the switchhook, the line switch LS will operate to extend the calling line to the first idle rst selector A. The line relay 10 will now have its windings energized through the telephone T and will actuate. The slow-releasing release relay 11 will now be energized in a local circuit of the relay 10, ground being applied back through armature 12 to the release trunk 13 to maintain the line switch LS in seizure. The circuits are now in readiness for receiving the first digit of the called number.

Calling telephone T2 l Let it be assumed that the calling party desires'to call telephone T2, the telephone number of which is 26461. Responslve to sending the first digit 2 from the telephone dial, the relay 10 will retract its armature two times, the relay 11 sustaining its armatures over the current lapses. Two ground impulses are thus applied from armature 14, through armatures 15 and 16, winding of slow-releasing series relay 17, armature 18 to the vertical magnet, the said vertical magnet (designated Vert. M.) v operating to step the 'shaft so that the wipers 21 to 23 will align with the designated 2 level.

Before detailing the operation vfurther, it will be pointed out that the telephone T and the switches LS and A belong to lthe 4 oiice the telephone numbers of the lines tributary to this oilice will have telephone numbers starting with digit 4. Also, the od-normal shaft operated springsets a, b and c, are set to operate when the armature shaft is aligned with the 1, 2 and 4 levels of bank terminals, respectively.

.Going back to the condition when the w1p ers 21 to 23 aligned with the 2 level, the sprlngs of the set b will be engaged, so that upon relay 17 deactuating, following the last impulse, ground is thereupon applied trom 24 to the winding of relay 25, causing the latter said relay to actuate and lock through its armature 26 to the release trunk conductor 13. At the time the relay 17 actuated responsive to the sending of the impulses to the vertical magnet, ground from the release trunk 13 is applied through armature 28, vertical off-normal springs (designated V. O. N.) armature 29 to the winding of the relay 30, the latter said relay actuating and locking through the armature o the rotary magnet (designated Rot. M.) to grounded armature 32. Relays 25 and 30 are thus locked actuated, and the spring-set is closed with the wipers aligned with the 2 level. At the time the rela 17 deactuated, and ater relay 25 actuate ground from the release trunk 13 is applied through armatures 28, 35, 36 and 37 to the winding of the rotary magnet, the latter said magnet operating to step the wlpers in to the first set of bank ter` minals.

The wipers 21 to 23 are now resting upon bank terminals 38 to 40, respectively. IWhen the rotary magnet operated, it opened the locking circuit for relay 30. However, if the wiper 21 had encountered. busy ground on the bank terminal 38, this ground would have been applied through armature 43, armature on the rotary magnet, off-normal springs, armature 29 to the winding of relay 30, at the time the armature on the rotary magnet retracts. Relay 30 will therefore lock as before and cause the rotary magnet to advancethe wipers another step, this operation continuing as long as the wiper 21 encounters busy grounds.

However, when wiper 21 fails to receive ground when advanced under the driving power of the rotary magnet, the relay 30 will not be caused to actuate and lock, so that the wipers will not be driven further. That is, if wiper 21 fails to receive ground on bank terminal 38, the relay 30 will not reactuate. On the other hand, the windings of relay 30 and relay 45 will then be in series, sincethere is no ground applied to conductor 46 from the wiper 21 or the armature 32. Relay 45 will actuate, while relay 30 will not, due to the marginal adjustment of the relay 30. The said actuation of relay 45 effects the seizure of the trunk leading from the first bank terminal set to the incoming second selector B. Relays 10, 11 and 25 will now deactuate.

. vThe conductor 13 in switch A will noW receive ground from the repeater 'R over wiper 21. The calling telephone T is now in series with the line relay of the repeater R.

The line relay of the incox'nin second selector B is now ener ed throu'gllyi; contacts con` trolled by thelme relay in the repeater R.

, Therefore, annexing the last four digits A 5 6-4--6-1 of the telephone number will complete the connection to telephone T2. Hangmg up the receiver at telephone T will cause ground vto be removed from the conductor 13, whereupon relay 45 will deactuate and close a circuit from grounded armature 14, varmatures 15, 16, vertical off-normal springs to the release magnet, the release magnet operating to restore the shaft of switch A yto normal resting position.

OwZZzng telephone T' Had the call been to telephone T3, the telephone number of which is 14341, the operation would be the same as described for calling telephone T2, only in this case the springset a will be operated responsive to digit 1, in place of spring-set b, responsive to digit 2.

Uallz'ng telephone? Assume that the call is to telephone T4, the

telephone number of which is 43351. Rememberingthat the calling telephone T is tributary to the 4 oice, it will be clear that there will be no inter-office trunks used in the connection. 'In fact, local trunks running direct from the 4 level of switch A will extend direct to the connectors as G in the same oilice, and the latter have access to the called lines as T5.

Sending the yrst dz'gz't sem'cs The operation responsive to the calling party removing his receiver from the switchhook has been described. The first digit in the present instance will be 4, indicative that the called line is tributary to the oiice to which the calling line is tributary. The shaft of switch A will then be aligned with the 4 level responsive to sending the first digit 4. Th's will cause the spring-set c to be operated. When the relay 17 deactuates, following the last impulse of the series of four, ground applied from armature 24, through spring-set c, armatures 50, 51,l makebefore-break spring 52, lower winding of differentially wound relay 53 to grounded battery, the latter said relay actuating and locking through armature 54 to the release trunk conductor 13, which latter conductor is grounded through armature 12. rThe ground applied from through the spring-set c will also be applied to the winding of the release magnet, causing it to operateto restore the wipers 21 to 23 to their normal resting position. vArmature 55, in attracting, will operatively energize the winding of. relay 25, so that it will actuate and lock in the manner before described to disable the spring-set c,- t and to prepare a circuit path for the rotary l magnet. The vertical magnet is disconnected at amature 18. y i Sending the second digit series When the calling party now sends the second digit 3, it causes three ground impulses to be sent from armature 14, through armatures .15, 16, windingof relay 17, armatures 36 and 37 to the winding of the rotary magnet. The rotary magnet will thus drive the wipers 22 and 23 along the normally aligned level, designated normal, three steps, so that the wiper 23. will then rest on bank terminal 58. The rotary olf-normal spring-set It. O. N. will Ybe operated, under this condition, so that when relay 17 deactuates following the last impulse, ground through this spring-set will be applied through armatures 60 'and 61, wiper 23, bank terminal 58, upper winding of relay 53 to grounded battery, the two windings of the latter said relay neutralizing the energizing eiect of each other, so that the armatures thereof will retract, unlocking the lower '.winding.l The core of relay 53may be slugged to retard its attraction after energization, in order to make the unlocking more easily adjusted for. The retraction of armatures 18 and 36 will cause the impulse circuit including the winding of relay 17 to be disconnected from the winding of the rotary magnet and reconnected to the winding of the vertical magnet. The retraction of the armature 61 closes a circuit from ground, rotary oil-normal spring-set, armatures 60 and 61, lower vertical olf-normal 100 spring to the wind'ng of the release magnet, the release magnet operating to restore the wipers to normal resting position. The relay 25 is sustained locked.

The first two digits 4 3 have been sent and 105 the wipers of the switch A are in the same position as after the calling party initiated the call, but before any digit impulse series were sent. There is this diiference in the condition of the switch A; the relay 25 is n ow 110 V Athree 'ground impulses from its armature 14 through the winding of relay 17 and armature 18 to the windin g of the vertical magnet, stepping the wipers up into alignment with the 3 level. Atthe time the wipers stepped ver- T120 tically, the vertical off-normal springs operate and a circuit path can be traced as when the first digit 4 was sent, from the grounded release trunk 13, attracted armature 28, upper oil-normal springs, armature 29 to' the 125 winding of relay 30, the latter said relay operating and locking to armature 32 as before described. lThe latter said armature 32 also maintains ground on the upper terminal of the winding of relay 45 to keep-it short-cir- 130 vao known manner.

vbe applied through armatures 28, 25 and 37 to the winding of the rotary magnet, causing the rotary magnet to operate to step the wipers 21 to 23 into engagement with the first set of bank terminals to 67, respectively,

At the time the rotary magnet operated as last described, its armature opened the lockino' circuit for relay 30, so that it therefore deictuated responsive to stepping the wipers in to the lirst set of bank terminals of the 3 level. However, if it is assumed that the wiper 21 encountered busy ground on bank terminal 65, this ground will be applied through armature 43, conductor 46, armature of the rotary magnet, upper vertical off-normal springs, armature 29 to the winding of relay 30, the latter said relay actuating and again locking through armature 32. The attracting of armature traced energizing path to the winding of the rotary magnet, so that the rotary magnet will operate to advance the wipers 21 to 23 to the next level. If the wiper 21 again encounters ground on its cooperating bank terminal, the relay 30 which unlocked when the rotary magnet operated, will again actuate and lock and the wipers 21 to 23 will thereupon be further advanced to the third set of bank terminals, the operation continuing as long as the wiper 21 finds busyA ground.

However, if when the wipers 21 to 23 engaged bank terminals 65 to 67, the wiper 21 did not receive busy ground from bank terminal' 65, the relay 30 will not be caused to reactuate to cause the wipers to further advance off the first set of bank terminals. Moreover, when armature 32 retracts while there is no ground applied back from the wiper 21, the windings of the relays 30 and 45 energize in series from battery derived through the winding of relay 30, the relay 30 being marginally adjusted to not actuate under this condition, although the relay 45 will actuate to'effect the seizure of the local trunk leading from bank terminals 65 to 67 to the connector G. Relays 10, 11 and 25 will deactuate under the condition of relay 45 actuating.

Sending last two digit series The calling party will nowanneX the last two digits 5-1, and thereby operate the connector G in the well known manner to select the called line leading to telephone T4. The release trunk 13 will receive its ground'from connector G over the wiper '21, in the well The called line will be rung 35 will again close the' (second) set of bank terminals of the 3l upon and the response thereon will operate the back-bridge relay in the connector in the well known manner.

Abandoningthe @all store the wipers of the switch A to their norv mal resting position.

Should the calling party have abandoned the call following the sending of the rst digit 4 while the wipers are in the restored' condition, before sending the second digit 3, the relays 10, 11, 53 and 25 will restore. And should the calling party have abandoned the call following the sending of the second digit 3 while the wipers are in the restored' condition before sendinef the third digit 3, the relays 10,

11 and 25 will restore, the relay 53 having already restored responsive to the second digit 3. v Applying tone if wrong digit is sent V It will be noted that should the second digit have been any other digit than 3, the wiper 23 would not have come to final rest on bank terminal 58, so that the release magnet would not be operated to rest-ore the wipers 21 to 25 to their normal resting position, because relay 53 would then remain actuated and hold the circuit of the release magnet open at attracted armature 61. On the other hand, the wiper 23 would have come to rest upon a bank terminal tiedto tone conductor which constitutes tone applied through current-limiting resistor 71 from tone source M. Rememberlng that relay 25 is actuated and locked under the condition that the shaft rotates on its I normal level, it will be clear that the wiper 23 will derive current constituting tone from any bank terminal it rests upon, excepting the bank terminal 58, which occupies the third rotary position. This tone will be applied through wiper 23, armature 72, armature 73 on the release magnet to the lower talking conductor leading to the line switch LS vand telephone T, to apprise the calling party that the second digit sent is not pertinent to the oiiice'of the system indexed by the first digit 4. The calling party will understand that he must hang up his receiver and make a new call, in order to unlock relay 25 and thereby close the energizing path at armature 61 for operating the release magnet. Y

In this connection, it will be noted that when the wiper 23 comes to rest on only bank terminal 58, the relay 53 will unlock and relay 17 will thereupon deactuate consistent with its slow-releasing characteristic, and thereupon by its armature 60 close a circuit path from ground, rotary off-normal spring-set, said than bank terminal 58, the relay 53 ywill not be unlocked, so that the release magnet will not operate and the tone will .be applied until the calling party hangs up his receiver to remove the ground from the release trunk conductor 13 to unlock the relay 53.

From the descriptions, it will appear that unless the first two digit series are both pertinent to the telephone numbers belonging to the oiiice to which the calling line belongs, it will be impossibleto eii'ect a connection to one of these lines. This. thus insures that 1f an error has been made by way of omitting a digit series, or sending the wrong train of series, `the call will not be lprogressed to a telephone of the oiice to W ich the calling line belongs.

Calling telephone T5 Should the last call to telephone T4 have been directed to Vtelephone T5, the telephoneA number of which is 43431, the operation of the switch A will be the same as when telephone T4r was called, with the exception that the wipers are caused to be aligned with the 4 level in place of the 3 levell responsive to sending the third digit series. v l

It' is noted, that while when the first digit series constituted the digit 4, the spring-set c operated to energize the lower winding of relay 53, when the armature 51 retracts, when the spring-set c is again operated responsive to sending the third digit 4 when calling telephone T,it will be to no operative eil'ect since the armature is attracted, due to the locked condition of relay 25.

@capacity of the switch A 1t willthus be seen that should the exchange system be made up of three offices, as exampled, two levels of a ten olnormal level selector will correspond to remotely located oces, while the remaining od-normal levels may be used for trunks to connectors. That is, there may be eight hundred lines reached through eight `levels of the switch A, em-

ployed as a third selector, wherein this switch A and a connector will be the vonly numerical switches in a connection from a calling line to a called line. This is against employing the switch A as a first selector wherein there will be a'second selector and a third selector intermediate of the switch A. and the con- 5 nector in calls to lines in remote offices. The

. shaft 1 level is shown used for inter-cnice trunks. This level ma be used for local trunks to connectors and therefore represent one hundred lines .capacity of the office containin the switch A. The 3 level as well as other avels may be used for inter-oHice trunks. Then, if a false impulse constituting digit 1 is accidentally prexed, the wipers will not be capacitated to rotate in. This latter having in mind that under the condition of the 1 level not being an inter-oliice trunk level, the spring-set a will be adjusted to not operate at the 1 level position of the shaft, but to be adjusted at some other level used for interoce trunks, the 3 level, for example, if the inter-oflice trunks are assumed transferred from the 1 levelto the 3 level.

In further explanation of the latter referred to operation, unless the relay 25 is in its actuated condition, the circuit to .the winding of the rotary magnet would be the case if the shaft is first operated with reference to a level that does not cause the relay 25 to actuate and lock. n the drawings, there is no springset operated when the is operated with reference to the 3 level, and therefore, should an impulse series corresponding to digit 3 be sent first, either by accident or intent, the shaft will remain aligned with the 3 level (without rotating in) until the calling party hangs up his telephone. This arrangement `thus insures that unless the full range of five digits is sent, it will not be possible to complete a call to a called line, regardless of the fact than when callin certain telephone numbers, telephones T4 and T5, but three digit series are actually effective in extending the call by a progressive advancement of the call exten'- sion, this being the last three of the five sent, although the rst two series have a preparatory purpose.

Reference is made to my U. S. Patent No. 1,711,311, granted April 30, 1929. Reference is also made to my pending applications for U. S'. Patents, Ser. N o. 171,637, filed May 29, 1917; Ser. No. 362,321, iled March 1, 1920;

Ser. No. 481,259, originally filed June 29,

1921. It is intended to claim only .such specific structure in the instant application as is not claimed in these listed references.

l claim :e

1. In a telephonesystem, means including a pluralityof serially related directivelycontrolled automatic switches for connecting a calling and called subscribers line, two less similar switches for connecting the said calling line with another called subscriber-s line, a uniform numbering system in which all the said subscribers lines have the same number. of digits in their telephone numbers, and means included in one of the switches used in calling said second called line and dependent upon the extent of selective movement of the will be open, as

as those extending to switch eiective to cancel any two of the digits of thenumber including dissimilar digits.

2. In a telephone system, means including a plurality of serially related directively controlled automatic wiper switches for connecting a calling and called subscribers line, two less similar switches for connecting the said calling line with another called subscribers line, a uniform numbering system in which all the said subscribers lines have the same number of digits in their telephone numbers, and means for operating one of the switches used in calling said second called line so as to cancel any two of the digits of the number including dissimilar digits, whereby responsive to directively applying the third digit to said one of the switches its wiper will be operated from normal resting position.

3. In a telephone system, means including a plurality of serially related directvely con trolled automate switches for connecting a calling and'called subscribers line, two less similar switches for connecting the said calling line with another called subscribers line,

phone numbers,

a uniform numbering system in which all the said subscribers lines have the same number of digits in their telephone numbers, means included in one of the switches used in calling said second called line and dependent upon the extent of selective movement of the switch effective to cancel any two of the digits of the number including dissimilar digits, and means whereby one of the switches used in the series relationship in extending connection to the first said called line is subject to use in the connection to said another called line.

4. In a telephone system, means including f a plurality of serially related directively controlled automatic switches for connecting a calling and called subscribers line, two less similar switches for connecting the said calling line with another called subscribers line 'wherein one of said switches is common to said connections, a uniform numbering system in which all the said subscribers lines have the same number of digits in their teleand means in said common switch for canceling any two of the digits of the number including dissimilar digits of said another called line when it is being called.

5. In a telephone system, a calling line, a directive device on the calling line for sending digit series of control impulses, irst and second called lines, a uniform numbering system wherein eachcalled line has the same number of digits, a rst selector, a second selector, a. third selector and a connector adapted to be connected in tandem comprising the numerical automatic switches used in linking a call from the calling line to said first called line,- said first selector and another connector adapted to be connected in tandem comprising the numerical automatic switches used in linking a call from the calling line to ber of said said second called line, a connective terminal Jfor said first selector, means whereby the connective terminal will be moved from normal resting position to seize said second selector responsive to the first series of control impulses sent over thecalling line' fromthe directive device only under the condition that this first series has a predetermined number -second selector, a third selector and a connector adapted to be connected in tandem comprising used in linking a call from the callin line to said first called line, said first se ector and another connector adapted to be connected in tandem comprising the numerical automatic switches used in linking a call from the calling line to said second called line, and means in said rst selector for canceling two of the digits in the telephone numsecond called line while not canthe numerical automatic switches celing any of the digits in the telephone number of the said rst called line.

7 In a telephone system, a calling line, first and second called lines,a uniorm numbering system wherein each called line has the same number of digits, a first selector having a wiper for linking connections ahead, a second selector, nector adapted to comprising the numerical used in linking a call from the calling line to said rst called line, said first selector and another connector adapted to vbe connected in tandem comprising the numerical automatic switches used inlinking a call from the calling line to said second called line, and means in said first selector forcanceling two of the digits in the telephone number of the said second called line by operating and rebe connected in tandem automatic switchesl a third selector and a con-4 lOl storing said wiper while not canceling any of the digits in the telephone first called line.

8. In a telephone system, means including a plurality of serially related directively controlled automatic switches for connecting a calling line to a desired one ofa plurality of called subscribers lines, two less similar switches for connecting the calling line with a said called line wherein one of said switches is common to said connections, said common switch having a shaft and a wiper carried by the shaft which has a normal resting position, the wiper for' linking connections ahead in tandem to the next successive one of number of said said switches involving moving the Wiper off-normal, a uniformA numbering system in which all the said called lines havethe same nu-mber of digits in their telephone numbers, and means in said common switch for canceling any two of the digits of the number including dissimilar digits of a certain one of the said lines when it is being called, each said digit cancellation involving. restoring the wiper from an oli-normal position to normal position and thereafter, when the two digits have been thus canceled, reoperating said wiper olf-normal responsive to an annexed digit of the telephone number of said certain called line in effecting a linking ahead towards said certain called line.

9. In a telephone system, an automatic switch having a wiper in normalresting' position, a level of bank terminals aligned with the normal position of the wiper and cooperative with the wiper, o-normal positioned levels of bank terminals cooperative withl the wiper, means for operating the wiper directly from normal to select a predetermined oil-normal level and a' bankI terminal in the selected level responsive to a single automatic directive operation in selecting the oli-normal level by the wiper, and means for operating the wiper from normal three times responsive to three automatic directive operations in order to select another of said levels, one of said operations of the wiper from normal being along said normal level and two other said operations being in intersecting plane to said normal level. I

l0. In a telephone system, an automatic switch having a wiper; in normal resting position, a level of bank terminals aligned with the normal position of the wipers and cooperative with the wiper, off-normal positioned levels of bank terminals cooperative with the wiper, means for operating the 'wiper directly from normal to select a predetermined off-normal level and a bank terminal in the, selected level responsive to a single automatic directive operation in selecting' the OE-normal level by the wiper, and means for operating the wiper from normal three times responsive to three automatic directive operations in order to select another of said levels, the first and third said operations of the wiperfrom normal being in intersecting;r plane to said normal level and the second of said operations being along said normal level.

l1. In a telephone system, an automatic' wiper switch, ltrunk lines of two dillerent non-consecutive numerical orders leading out from said switch commonly accessible` from the wiper, a calling line leading-in to said switch, a calling device for directively operating' the switch over the calling line by sending numerical order digit impulse series f from theA calling'device in order to connect wiper switch, trunk lines of two different non-consecutive numerical orders leading out from said switch commonly accessible from the wiper, a calling line leading-in to said switch, a calling device for directively operating the switch over the calling line by sending numerical order digit impulse series "from the calling device in order to connect the wiper of the switch to a desired numerical order trunk line, means for causingv the'switch to operate its wiper from normal resting position responsive to each impulse series sent from the calling device until a trunk has been connected to by the wiper, and means governed by the number Vof impulses of the first digit series sent to operate the switch which will determine to which numerical order the trunk which maybe connected to must belong.

13. In a telephone system, an automatic wiper switch, trunk lines of two diii'erent non-consecutive numerical orders leading `out from said switch commonly accessible from the wiper, a calling-line leading-in to said switch, a calling device for directively operating the switch over the calling line' by icc sending numerical order digit impulse series l from the calling device in order to connect the wiper of the switch to a desired numerical or er trunk line, means for causing the switch to operate its wiper from normal resting position responsive to each impulse 4 series sent from the calling device until a trunk has been connected to by the wiper, and means governed bythe number of impulses in the first series sent to operate the Wiper which will determine if this first series, of impulses will select the trunk to be employed, or whether two more impulse series must be annexed to effect the selection of the trunk to be employed.

14.'In a telephone system, an automatic wiper switch,- trunk lines `of two different non-consecutive numerical orders leading out from said switch commonly accessible from the wiper, a calling line leading-in to said switch, a calling device for directively operating the switch over the calling line by sending numerical order digit impulse se-v ries from the calling device in order to connect the wiper of the switch to a desired numerical order trunk line, means for causing the switch to operate its wiper from normal resting position responsive to each impulse series sent from the calling device until a trunk has been connected to by the Wiper, means governed by the number of impulses of digit series .sent to operate the switch which will determine to which numerical order the trunk which may be connected to must belong, and means whereby if a trunk is not selected responsive to the first series sent, the second series sent must have a predetermined number of impulses to render possible the selection of a trunk responsive to the third series..

15. In a telephone system, an automatic wiper switch, trunk lines of two different non-consecutive numerical orders leading out from said switch commonly accessible rom the wiper, a calling line leading-in to said switch, a calling device for directly operating lthe switch over the calling line by sending numerical order digit impulse series from the 'calling device in order :to connect the long,

wiper of the switch to a desired-numerical order trunk line, means for causing the switch to operate its wiper from normal resting position responsive to each impulse series sent from the calling device until a trunk has been connected to by the wiper, means governed-by the number of impulses of digit series sent to operate the switch which will determine to which numerical order the trunk which may be connected to must belong, means whereby if a trunk is not selected responsive to the first series sent, the second series sent must have a redetermined number of impulses to ren er'possible the selection of a trunk responsive to the third series, and means for applying a signal to the calling line responsive to the second series being sent, provided that the second series is not said predetermined series. Y

16. In a telephone system, an automatic wiper switch, trunk lines of two diierent non-consecutive numerical orders leading out from said switch commonly accessible from the wiper, a calling line leading-in to said switch, a calling device for directively operating the switch over the 'calling line by sending numerical order digit impulse series from the calling device in order to connect the wiper of the switch to a desired numerical order trunk line, meansfor causing the switch to operate its wiper from normal resting position responsive to each impulse series sent from the calling device until a trunk has been connected to by the wiper, means governed by the number of impulses of a digit series sent to operate the switch which will determine to which numerical order the trunk which may be connected to must bemeans whereby if a trunk is not selected responsive to the rst series sent, the second series sent must have a predetermined number of impulses to' render possible the selection of a trunk responsive to the third series, and means for applying a signal to the calling line responsiveto the second series being sent, provided that the second series is not said predetermined series, last said means including a means for moving the wiper in a plane intersecting the plane the wiper operated in responsive to the first series sent.

17. In a telephone system, an automatic switch having a wiper in normal resting position, a iirst group of'trunks and a second group of trunks accessiblek from said wiper, means for selecting a trunk of said first group responsive to a single directed movement of the wiper from said normal resting position, and means whereby a trunk of said second group can be selected only responsive to three directed movements of said wiper from said normal resting position whether said rst two movements are similar or not.

18. In a telephone system, an automatic switch having a wiper in normal resting position and having a vertical androtary movement, a first group of trunks and a second group of trunks accessible from said wiper, means for selecting a trunk of said first group responsive to a single directed movement of: said wiper from said normal positoin in a vertical direction and an automatic hunting movement responsive to the directed movement, and means whereby a trunk of said second group can be selected only responsive to three directed movements of said wiper from said normal position one of said movements being rotary and an automatic hunting movement responsive to the last one of said three directed movements.

19. In a telephone system, an automatic switch having a wiper in normal resting postion, a first group of trunks and a second group of trunks accessible from said wiper, means for selecting a trunk of said first group responsive to a single digit directed movement of said wiper from said normal position, and means whereby a trunk of said second group can be selected only responsive to three digit directed -movements of saidwiper from normal position, wherein said wiper is restored to normal position after the rst two of said directed movements whether responding to like or dissimilar directive digits. i

20. In a telephone system, an automatic switch having a wiper in normal resting position, group of trunks accessible from said wiper, means for selecting a trunk of said first group responsive to a single directed movement of said wiper from said normal posiv tion, and means whereby a trunk of said second group can be selected only responsive to three directed movementsA of said wiper from normal position, wherein said wiper isi restored to normal position after the rst two lof said directed movements and wherein the a first group of trunks and a second second directed movement of said wiper is in a plane intersecting its first directed movement.

21. In a telephone system, an automatic switch having a wiper in normal resting position, a rst Group oftrunks and a second group of trunks accessible from said wiper, a first relay, means including said relay for selecting a trunk of said first group responsive to a `single directed movement of said wiper from said normal position, a second rela and means including said second relay wliereby a trunk of said second group can be selected only responsiveto three directed movements of said wiper from normal position.

22. In a telephone system, an automatic switch having a wiper in normal resting position, a first group of trunks and a second group of trunks accessible from said Iwiper, a first relay, means including said relay for selecting a trunk of said first group responsive to a single directed movement of said wiper from sa1d normal posltion, a second relay, and means including said second relay actuation of said first relay while said secp ond relay remains deactuated for selecting a trunk of said first group responsive to a single mal position, and means including the acdlrected movement of said wiper from norresponsive to a single digit' directed moves ment of said wiper from sa1d normal s1- tion, and means whereby a trunk of sai second group may be selected responsive to three f digit directed movements of said wiper from normal osition wherein two dissimilar directive digits are canceled by drop-back action of the wipers of the switch.

In witness whereof, I hereunto subscribe my name this twelfth da of Ma 1930.

' HERBERT FR NDLY. v

tuation of said second relay whereby a trunk of said second group can be selecte only responsive to three directed movements of said wiper from normal position.

24. In a telephone system, an automatic switch having a wiper in normal resting position, a first group of trunks and a second group of trunks accessible from said wi er, means for selecting a trunk ,ofi said rst group responsive to a single di it directed movement of said wiper from sai sition, and means whereby a trunk of said second group may be selected responsive to A three digit directed movements of said wiper sition, a first from. normal position wherein two like or dissimilar directive digits are canceled by drop-back action of the wipers of the switch.

25. In a telephone system, an automatic switch having a wiper in normal resti-ng poiroup of trunks and a second group of trun s accessible from said Wiper,y means for selecting a trunk of said rst group normal ponrs4

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