US1724189A - Telephone system - Google Patents

Description

Aug. 13, 1929. GOHORELE ET AL TELEPHONE SYSTEM Original Filed Sept 29, 1926 2 Sheets-Sheet 1 -Imren urs Fernand Euhur'El Elaudms SW1??? 5% 52 q 4.14 C1G( Aug. 13, 1929 F. GOHOREL ET AL 1,724,189

TELEPHONE SYSTEM Original Filed Sept. 29, 1925 2 Sheets-$3981; 2-

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TI I) Imren cars Far'naud Buhur'el Claudius SHEET Patented Aug. 13, 1929.

UNITED STATES PATENT OFFICE.

FERNAND GOHOEEL AND CLA'UDIUS STEWART, OF EARIS, FRANCE, ABSIGNORS T0 AUTOMATIC ELECTRIC me, or CHICAGO, rmruors,

WARE.

A CORPORATION OF DELA- IELEPHO'NE SYSTEM.

Application filed September 29, 1926, Serial No. 138,364, and. in France October 2, 1925. Renewed January The present invention relates to telephone systems and is more particularly concerned with systems in which register senders are employed for responding to digits d alled by a calling party and sending out trains or impulses in accordance therewith. In Bntish specification No. 245854 a descript on is given of a system of this type in wh1ch a portion of the number dialled is translated into series of impulses which may differ 111 number and value from those received. This translation is determined by means of movable connections between the translator and the controlling device tor transmitting the series of impulses; and the arrangement is such as to permit the use ot a single set of movable. connections for several register senders.

lhe broad general object of the present invention is to provide various improvements in. systems of this type. Accordingly one of the chief aims is to obtain a combination of circuits whereby, by means of the abovomcntioned set of movable connections, calls may be set up to lines having a call number, which has a variable number of digits or figures and in particular limited to the part translated.

Another object of the invention is to obtain by means of the set of movable connectior a combined action on that number of se s of impulses, which corresponds to the translated part of the number registered and permitting the said number of series of impulses to be varied, this combined action being obtained by means of a reversal o't current in the impulse control circuit. 7

Another object of the invention is to obtain a slow acting device whereby when an incomplete call is made, the part setup can be released and a combination of a particular series of impulses are sent back by the register sender in order to transmit the call over the lines specially provided for these false calls.

A further object of the invention is to obtain a circuit combination enabling a switch to be used for controlling the number of line pulses having Ill positions instead of 12 as in the patentpreviously referred to.

Another object of the invention is to obtain a register sender selecting switch having a normal position, the said position being itself connected to a register sender and being thus a functioning position.

A. still further object of the invention is to obtain a circuit combination for testing and holding the register sender, which is at the same time under the control of the calling station and ot' the register sender. This arrangement enables the transmission of a special impulse of current to be dispensed with for causing the devices, which set up the connection, to pass into the speaking position.

Another object of the invention is to obtain a circuit for a selector ot the Strowger type able simultaneously to hunt over two sets of lines, the testing and connecting device comprising a relay for controlling the movement ottho selector, a testing and connccting relay and a relay for steering onto the selected line. This device enables the number of contacts at the selector to be reduced.

Still another object of the invention is to obtain. a simple or compound metering device, which is put in action by an electrical combination over the leads of the trunk line.

One method of carrying out the invention will now be described with reference to the annexed drawings,comprising Figures 1 and 2, which show by means of the usual circuit diagrams a sufiioient amount of apparatus involved in a telephone system embodying the teaturcs of the invention to enable the same to be understood.

Fig. 1 shows a first selector repeater accessible to the line switch of a calling line and having individual thereto a director selector.

Fig. 2 shows a director accessible in common to the director selector of Fig. 1 and other director selectors.

When the calling party takes down his re ceiver, the relay 1 off his preselector is en ergized over: battery, relay 1, baclr contact 2, line lead 8, subscribers instrument, line lead 4, contact 5, earth.

he rotary magnet (3 ol the preselector then has its circuit closed over battery, magnet G, contact 7, front contact 8, back contact 9, wiper 10, contact 11 of the home position, the front contact 12, earth. This magnet opens its own circuit at 7 and advances its wipers into the first position. It the correlowing circuit: battery, magnet 6, 7, relay 13, contact 12, earth. The relay 13 closes its front contacts 2 and 5 (the magnet 6 is not energized 1n series with 13) and so sw1tches through the subscribers line over the wipers 14 and 15 and the corresponding contacts 16 and 17 to the first selector. The relay 18 of the first selector is then energized over: battery, upper winding of 18, contact 19, 16, 14,

2, '3, subscribers instrument, 4, 5, 15, 17, 20. lower winding of 18, earth. The relay 21 is i r then energized in series with the release magnet 22 (this not being energized in series with 21) over battery, magnet 22, t'ront contact 23, relay 21, earth. At 24 the relay 21 .closes the circuit of the rotary magnet 25 oil:

the director selector over: battery, magnet 25, 26, back contact 27, back contact 28, 24, earth. 1

The director selector is rotated in they manner of an ordinary rotary switch until "its circuit is opened at 27 when the relay 29 is energized upon finding a suitable po cntial at the bank contacts engaged by the t t wiper. ,The circuit is then: battery, first winding of relay 80, 81, 32, 33, 34, wiper 35, relay 29, 28, 24, earth.

The relay 29 is then energized and at 36 closes the circuit of relay 37. The dial tone is'then sent to the calling party over battery, 38, back contact 39, front contact 40,

'41, right hand winding of 42, 43, coneenser,

line of the calling party. The relay 44 is energized at the-same time by battery 38, 39, 40,45, 46, wiper 47, 48, right hand winding of 49,50, wiper 51, 52,. 53, back contact 54,

earth. The relay 54 is then energized ever battery, 55, left handwinding of relay 56, back contact 57 upper winding oi 54, 58, 59, earth. "The relay 56 is not energized.

At the director, the relay 80, on energizing in series with the relay 29 of the selector, connects its two windings in series on opening the contact 31, thus reducing the batter potential on the test contacts in the banks of the director selectors in order to prevent other selectors coming to rest on the seized director. At 60 a locking circuit is closed which is not dependent on the contact 32; at 61 earthis put on the starting lead of the imfl pulse machine and on the polarizing windings of the polarized relays and over 62 the circuit of relay 63 is closed. 'At 64 the'circuitis closed over a slow interrupter for the two-step relay 65.

The relay 68, on energizing, at 66 prepares the impulse circuit, at the back contacts 67, 68, 69 and 7 0 opens the release circuits of the registers, and at the front contact 69 it short circuits the low resistance winding of relay 71.

lVhen the calling subscriber transmits the first digit or letter or the wanted subscribers number, his dial generates a number of interruptions in the line corresponding lo the digit transmitted. At each line interruption, the relay 18 of the selector falls back and transmits one impulse over the circuit: earth, 23, 72, 73, the impulse wiper ol the director selector 74, 75, 66, winding ol relay 76, the wiper and the first bank contact 77', of the digit distributor, the lifting magnet 78 ot' the ollice register to battery. For each impulse received, the litting magnet raises the shaft and wipers one step. The relay 76 is energized in series with the lifting magnet, and being slow acting, it remains attracted tor the duration 01 the series ol impulses. Similarly relay 21 ot the selector is short circuited at each impulse, thereby rcndering it slow to release, and it remains in the operated position during the series of impulses. The relay 76 of the director, on energizing, at 79 closes the circuit oil the rotary magnet 60 of the digit distributor, which is energized, but does not more the wipers until it releases.

At the end of the train of impulses, the relays 1S and 21 ot the selector remain in their operated position, and a moment later the relay 76 oi the director talls back and opens the circuit of the magnet ot the digit distributor. This magnet on falling back advances its wipers onto the second series of contacts its bank. In the second position the impulse circuit is connected to the rotary magnet 81 of the oflice register.

The second series of impulses is received in the manner described above for the first series, but for each impulse of the series, the rotary magnet advances the wipers over a contact in the level detern'iined by the first digit. At the end of the second series of impulses the relay 76 falls back and the digit distributor advances its wipers onto the third contact of its bank. At this time the digits indicating the exchange to which the wanted subscriber belongs have all been registered, and accordingly the sender connnences to function for transmitting the trains of impulses rcquired for reaching the *antcd exchange. In order to simplify the description however the registering ol the numerical digits will be described before describing the operation of the sender.

When the register controller is in the third position, the impulse circuit is connected to the rotary magnet of the thousands register Ill iositioned onto the corres )ondin contacts net 83 of the sender is closed over: eartl'i,

when the fourth, fifth and sixth digits of the wanted number are received, and when the register controller passes into the seventh posit-ion, battery is connected to the impulse circuit in order to maintain the circuit of relay 21 of the selector.

Before describing the operation of the sender, it is necessary to consider the con nections between the banks of the oliice register, the digit registers and the sender.

the numerical registers in such a manner that the polarized stopping relay finds a potential of the polarity required for its operation when the wiper of the sender linds itself on the contact corresponding to the positioning of the numerical registers.

By means of an intermediate distributing frame common to a certain number of directors, the bank contacts of the director are connected to the potential desired for sending the ditl'erent trains of impulses required for reaching the wanted exchange.

In the drawing the connections shown are such that the first two digits received are translated to 437, that is to say, the director will send three trains oi impulses, the first being composed of 4 impulses, tae second of 3 impulses and the third oil 7 impulses.

When the digit distributor reaches its third position a circuit for the rotary magwiper and bank 82 of the digit distributor in the third position, front contact Set, hack contact 85, the lIItQI'IUPht-Bl contacts 86 oi? the impulse machine, the rotary magnet of the sender and battery.

lV hen the circuit is interrupted by the impulse machine at the interrupter 86 the first time, ti o rotary magnet oi the sender advances its wipers onto the second contact of its bank, and at contact 87, which is closed when the Wiper of the sender leaves its normal position, a circuit closed tor the relay 88 over earth, front contact 69,the front contact 87, relay 88 and battery. On energizing, the relay 88 at 89 opens the loop, which contains one of the windings of relay 49, across the line to the selectors, and at the front contact it connects this line in series with the impulse contacts 90 of the the relay is operated.

sender causes the circuit to be prepared for the transmission of impulses to the selectors.

The succeeding impulses from the impulse machine cause the wipers of the sender to adyance over the contacts of its bank, and at the same time the impulse contacts 90 (it the impulse machine open the line circuit to send an impulse to the selectors. At the end of the second impulse, the Wiper 9i; finds itself on the third contact of its bank and the circuit oil the left hand winding of relay is closed over the terminal of the winding, 9%, 97, wiper 98 in the first 'i )OSllLi0l1, 99, wiper 100 of the office register, connecting lead and terminal No. a of the distributing frame of the directors, the guarding resistance and battery, contact No. 3 and wiper 96 of the sender and the terminal oi the winding of relay 95. The direction of the current in this circuit is such that the relay 95 is not energized and the impulse machine continues to transmit impulses to the selectors and to the rotary magnet ()i the sender.

i'lt the end oi the fourth impulse, the Wiper 96' linds itself on the fifth contact of its bank, and at this moment the direction of current in the relay 95 is such that On energizing, the relay 95 at 85 opens the circuit of the re" tary magnet of the sender, at 101 it short circuits the line to the selectors and at 85 it closes the circuit of the relay 92. in energizing, the relay 92 at 102 short-circuits the line to the selectors, at 103 it looks itself, at 104- it opens the impulse circuit oi? the rotary magnet of the sender, at 105 it closes the circuit for returning the sender to normal by means oi: its interrupter contact, at 97 it opens the circuit of relay 95 and at 97 it connects the relay lOti in series with a winding of relay 10'? to the Wiper 98 of the out put controller.

lVhcn the circuit of the rotary magnet of the output controller is opened. at 104-, the magnet on falling back advances its Wipers into the second position. In this position the relay 106 is energized in the circuit: earth, right hand winding of relay 10?, relay 100, 97, wiper 98 and second bank con-- tact, 10S, wiper 109 of the oliice register, coi'inecting lead, terminal. l lo. ll of the distributin frame of the director, battery and th. The direction of: current in this circuit is such that the relay 107 is not energized; the relay 100 is energized and at 110 ensures the locking circuit of the director.

When the circuit oi the magnet of the sender closed at 105, the m ghct operates automatically and returns its 'ipers to their normal position. In that position the circult oi": the relay 88 is opened at 87 and the relay falls back a moment later. On releasing, the relay 88 at 89 puts the right hand winding of relay 4-9 in series with the normal position.

line to the selectors; at 91 it opensone of the locking circuits of relay 92 and at 94 it opens the circuit of relay 95. If the established part of the connection does not extend over a secondary line switch, the direction of current in the right hand Winding of relay 49 is such that the relay operates and the second locking circuit of relay 92 is opened at 111. An instant after its circuit has been opened at 111, the relay 92 falls back. The relays 92 and 88 are so adjusted that the selector has time to find a line before the relay 92 falls back. The circuits of the sender are now in the same condition as at the commencement of the transmission of. the first series of impulses; accordingly the second and third series are transmitted like the firstseries. At the end of the third series of impulses, when the output'controller passes into the fourth position, the current is reversed in the circuit of the relays 106 and 107 until the fourth wiper of the director is connected to the terminal G and the relay 107 is energized 1 in series with the relay 106.

The relay 107, on energizing, at 1.12 closes an automatic stepping circuit for the rotary magnet of the output controller over earth, 112, wiper 113, contact 114, interrupter contacts 115, rotary magnet 116 and battery. The magnet operates and advances the wipers into the fifth position. In the fifth position the control circuit .for the transmission of impulses is connected to the thousands register, the bank of which is connected to the bank of the sender as above described.

If the transmission of the number indicating the wanted exchange is finished before the calling subscriber has registered the thousands digit, a locking circuit for relay 92 is closed over: earth, relays 107 and 106, 97, 98 in the fifth position, 117, over the first contact of its bank, relay 92 and battery. Relay 92 remains energized in this circuit until the thousands register leaves its In the same manner the transmission of the hundreds, tens and units digits, is delayed until the corresponding register has left its normal position.

The numerical digits are transmitted in the manner described above. At the end of the series of impulses corresponding to the units digit, the output controller passes into the ninth position. In this position there is no circuit for the relay 106, and when the relay 88 falls back upon the Wipers of the sender returning to normal, the guarding circuit of the director remains open at 33. The opening of this circuit causes the relay 29 of the first selector to fall back and open at 36the circuit of relay 37. The. latter on falling back at 73, 52 and 46 opens the circuits to the director. At the director the relay 49 can no longer be energized (its cireuit being open at 46 and 52 at the selector), so the relay 92 remains energized. The relay 30 falls back an instant after the relay 92 has been energized. On falling back, the relay 30 at 61 opens the circuit of the relays 92 and 63 and the circuits of the polarizing windings of relays 95, 49 and 107.

On falling back, the relay 63 at 67, 68, 69 and 70 closes the circuits for returning to normal the digit distributor and the output controller, the office register and the numerical registers in series with the low resistance winding of relay 71. During the return movement of these devices, the relay 71 is energized and at 32 it opens the circuit of relay 54 in order to mark the director engaged during the release. At the end thereof, the relay 71 falls back and the director is then free to receive another call.

At the first selector the relays 44 and 54 are energized when the director sends the first series of impulses. Each time the interrupter contacts 90 of the impulse machine opens its circuit, the relay 44 falls back and sends an impulse to the lifting magnet of the selector over: earth, 59, 58, 118, lifting magnet 119 and over a pilot relay to battery, (2) the lower winding of relay 54 and battery. At the end of the first impulse the off-normal contact 57 is operated and the circuit of the upper winding of relay 54 is opened at the back contact and the cireuit of relay 56 is closed at the front contacts of 57 and 120. During the remainder of the series of impulses the relay 54 remains operated by the intermittent energization of its lower winding in parallel with the lift ing magnet. The relay 56, on energizing, at 121 prepares the circuit of the rotary 1nagnet 122, and at 123 and 124 it closes its locking circuit to earth over 1.25 and 126. An instant after the end of the first series of impulses, the relay 54 falls back, and at 127 the circuit of the rotary magnet is closed over earth, 126, 125, 127, 121, rotary magnet 122 and battery over a pilot relay. The rotary magnet is energized and causes the wip-. ers to pass onto the first lines of the selected level, and towards the end of its movement it opens the circuit of the relay 56 at its interrupter contact. On falling back, the relay 56 at 121 opens the circuit of the rotary magnet, which returns to normal.

If the first two lines are engaged, there is an earth on the two test contacts and the relay 56 is energized again over: (1) earth, contact and test wiper 128, 129, 130, the front contact of 57, the left hand winding of relay 56 and battery; (2) contact and test wiper 131, 132 and front contact of 120, right hand winding of relay 56 and battery. The relay 56, on energizing, again closes at 121 the circuit of the rotary magnet and the wipers are advanced onto the contact of the next two lines in the level. This operation nzaerse continues until the Wiper reaches an idle line. ll? the two lines are tree, the relay 133 is energized in the circuit: earth, 126, bacli': contact out 1231, relay 133, front contact c1 57, left hand Winding ct relay 56 and hat.

tery. Owing to the resistance 01' relay 183, the relay 56 is not energized.

If the first line is busy and the second line is free, the relay 56 has only one Winding energized and does not operate its contacts, and the Wiper remain on the two lines. Under tl ese conditions the relay 133 is short circuit-ed by earth on the Wiper 128, but the relay 135, not being short circuited, is energized in the circuit: earth, 126, back contact 18 1, the relay 185, 136, front contact 120, right hand winding of relay 56 and battery. On energizing, the relay 185 closes its locking circuit at 137, switches through the second set off Wipers at 129,138 and 13D; and at 129 removes the short circuit -from the relay 133, Which is energized in the manner described. above. l l hen the relay 133 is energized it opens at 59the circuit oi the release magnet 01 the selector, at 132 and 136 it disconnects the circuit of relay from the test Wiper 131, at 130 it puts earth on the test Wiper 128, at 89 it connects battery to the upper Winding ofrclay 5 1 and at 15 and 53 it connects the line to the 'WlPBl'S.

The other series 01 impulses transmitted by the director are received by the succeeding selectors.

When the connection is established, the

relay 29 falls back and the relay 141 in series With the right hand winding o't relay l2is connected across the line on the Wanted side in order to maintainthe connection. The direction of current in the relay 4:2 is such that this relay is not operated at this moment.

lVlien the Wanted subscriber replies, current is reversed in the line and the relay 12 is energized; at contacts 19 and 20 battery is reversed across the calling line; at 141:0 the circuitot relay 54- is closed over: earth, upper Winding of relay 54:, 39, 38 and battery. On energizing, the relay 5 1 closes locking circuit over 118, 126 and earth, and puts earth on the meter lead over earth, 126, 125, 1&1, 14-2, and metering lead At the end 01? the conversation, when the calling subscriber hangs up his receiver, the relay 18 lialls back, followed an. instant later by the relay 21. On falling back, the relay 21 removes earth from the test lead and opens the circuit of relays a l, 135 and 133. Then the relay 133 lalls hack, the circuit oi the release magnet 22 is closed over: earth, 59, 1 11, 145, release magnet and battery over a pilot relay. The release magnet, on energizing, releases the shaft 01 the selector, which returns to its normal position under the action of its restoring spring and its own Weight. In the normal position the shaft opens the circuit of the release magnet at contact 1 15; a non-inductive resistance is connected across the Winding of the release magnet in order to suppress the spark atcontact- 115.

in the caseol? nniltiple metering, for the supplenlcntary metering after the first metering it is only necei.

the positive line lead and to open the negatire lead. llnder these conditions the relay all; :l alls heel: and the circuit of relay 1 16 is closed over battery on the positive lead, 53, 52, relay 1 16, 117, 125, 126 and earth; the relay 1416, on energizing, at 1 12 opens the above-traced metering circuit. l/Vhen the line has seen returned to its normal condition, the relay 1% falls back and the relay 1-1 is again energized. On falling back, the relay 1% again closes the above-mentioned meter circuit at 1 12 and the meter is operated a second time.

T1? the director is taken into use by a false call (line loop earthed, etc.) it does not receire impulses and the relay 76 of the director is not energized. lVhen the relay 54; 01 the director energized, the circuit of interrupter lie. 1 is closed over the two-step relay This interrupter closes its circuit every 15 seconds, for example; hence about 15 seconds after the director hasbeen seized, the circuit 01 the high resistance Winding of relay closed. Under the action 01 this Winding, the relay (35 only operates the con tacts 1417, 1 18 and 14:9. At 11-17 a locking circuit is istablislied over 79 and 61, and at 149 the circuit of interrupter N0. 2 is closed over the relay 71.. The interrupterNo. 2 is so arranged that it closes 15 secondsafter the interrupter No. 1. l i hen the contact of No. 2 isclosed, the relay 71 is energized over: earth, interriuater No. 2, back contact 150, front contact 1 1-9, relay 71 and battery. On energizing, the relay 71 at 62 opens the cir cuit oi relay (33, which, on liallingback, at 66 connects the low resistance winding of ro lay '65 in series with the release magnet of the selector over the circuit: earth, low resistance Winding of relay 65, 1 12, 7 5, impulse Wiper 74 of thedirector selector, 73, 72, 23, release magnet and battery over a pilot relay. Under the action 01 its low resistance Winding, the relay 65 operates all its con- At 150 it opens the circuit of relay 71, at 99 and 108 it connects the Wipers 100 and 109 oi": the director to the desired potential for routing); the call to a lineiior false calls and at 151 it n'epares the circuit of the rotary magnet 83 ot the sender. When the relay 1'1 falls back, the circuit of relay 63 is again closed at (52 and this relay, on energiz ing, at 152 closes the circuit of the magnet or the sender over earth, 152, Wiper 82 0f the diait distributor in its normal position, 151, 8o, interrupter 86, rotary magnet 83 and: battery.

sary to put battery on The director now proceeds to transmit the series of impulses required for routing false calls to aspecial position and it releases in the manner described for a normal call. On ascertaining that there is a false call, the operator at the special position can prepare the line for finding false calls by putting battery on the positive lead and by opening the negative lead. This action causes the relay 44 of the first selector to fall back, and the relay 146 is energized over: battery on the positive lead, 52, relay 146, 147, 125, 126 and earth. On energizing, the relay 146 at 152 puts battery in series with a low resistance on the metering lead, thus arresting the finder switches for false calls. When the line having the false call is disconnected the relay 146 falls back and the selector is released in the manner already described.

What we claim as new and desire to secure by Letters Patent is 1. In an automatic telephone system using register translators any one of which may be connected to a trunk line over which a connectionis to be set up, a combined testing and holding conductor in the connection set up between a register translator and a trunk line, there being a current flow over said conductor while the connection exists between the trunk line and register translator, means in the register translator for stopping the current flow over said conductor, means inthe trunk line for stopping the current flow over said conductor and means responsive to the cessation of current flow responsive to either means for severing the connection between the trunk line and the register translator.

2. In a telephone system wherein connections are set up over trunk lines and wherein an auxiliary device is temporarily connected under the control of a testing device to a trnnklineover which a connection is to be set up, a combined testing and holding conductor included in the connection, said testing operation being carried out over said conductor, there being a holding current flowing over said conductor while the connection exists, means in the auxiliary device for stopping the current flow over said holding conductor, and means responsive thereto for severing the connection between such device. and the trunk line while leaving the connection set up over the trunk line.

3. In a register translator, a register for selecting an oflice code, a sender, means including a sequence switch having a plurality of positions for causing said sender to transmit the digits of a selected code, the control from the said sequence switch to the sender being exercised over a control conductor in accordance with potential of a given polarity from said register, and means including a polarized relay responsive to a potential of a reversed polarity over said control conductor from said register for automatically advancing said sequence switch through surplus positions when a code is transmitted having less than the maximum number of digits.

4. In an automatic telephone system wherein a register translator may be associated with the first switch of a train to control such switch and the other switches to set up a connection and wherein a register translator is arranged to send out a predetermined number to trunk the call to a preassigned place responsive to a delay by the calling subscriber in registering the number, a release magnet for restoring the first switch of the train, a circuit for operating said release magnet preparatory to transmitting said special number, and contacts located in said register translator for completing said release-magnet circuit.

5. In a counting device comprising a progressively movable step-by-step switch for counting impulses, said switch having a number of stop positions, said device being arranged to rest normally in the position corresponding to the highest number of impulses to be counted, and means for maintaining the normal position ineffective as a stop position until the device has rotated from its normal position and has reached such position after making a complete operation.

6. In an impulse sender for sending a variable number of variable impulse series, two polarized relays, and means for operating one relay to govern the number of impulses in each series and for operating the other to govern the number of series.

7. In an impulse sender for sending a variable number of variable impulse series, means responsive to current fiow of one polarity for governing the number of impulses in the respective series, and means responsive to current flow of reversed pollarity for regulating the number of series.

8. In an impulse sender for sending a variable number of variable impulse series, means responsive to current flow of one polarity for governing the number of impulses in the respective series, and means responsive to current flow of reversed polarity for cancelling unsent series.

9. In an impulse sender for sending a variable number of variable impulse series, means responsive to current flow of one polarity for governing the number of impulses in the respective series, and means responsive to current flow of reversed polarity 'for cancelling the remaining unsent ones of a predetermined number of series.

10. In a sender arranged to send a miiable plurality of series of impulses, a polarized relay, means for rendering said relay efiective between series to determine whether subsequent series are to be sent or skipped,

circuit connections such that any current flowing through the relay is in a given direction in case the next series is to be sent and is in the opposite direction in, case the next series is to be skipped.

11. An. impulse-counting device having a Wiper arranged for motion in a forward direction only over its bank of contacts. there being a separate digit contact for each (lif 't'erent digit value, and a single pick-up contact innnediately succeeding the contact corresponding to the highest digit value and immediately preceding the contact corresponding to the lowest digit value.

12. An impulse-counting device having a Wiper arranged for motion in a forward direction only over its bank of contacts, there being a separate digit contact for each dififierent digit value, and means for causing said Wiper to normally stand on the contact corresponding to the highest digit value.

13. An impulse-counting device having a wiper arranged for motion in a forward direction only over its bank of contacts, there being a separate digit contact for each different digit value, means for :ausing said Wiper to normally stand on the contact corresponding to the highest digit value, and means for rendering the normal contact ineffective as a digit contact until the wiper has traveled. around the contact bank.

In testimony whereof we have signed our names at Paris, France, this 7th day of September, 1926.

FERNAND GOHQBEL. CLAUDIUS STEWART.

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