BE433724A - - Google Patents

Description

       

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    TELEPHONE OR SIMILAR SYSTEMS
The present invention relates to telephone systems or the like and more particularly but not exclusively to pulse control and recording systems, for example for telephone systems in central offices.



   According to some of the features of the invention, a control system for a discharge device in a gas atmosphere having a determined discharge potential comprises a pre--

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 -mier capacitor, means for bringing a variable cnarge on this capacitor, a second capacitor, means for connecting these capacitors in series in a circuit connected to the terminals of said device, a third capacitor, a circuit for charging this third capacitor, and means for gradually charging the second capacitor by connecting said third capacitor alternately to its charging circuit and in parallel with the second capacitor,

   said device becoming conductive when the sum of the charges on the first and second capacitors reaches the discharge potential of said device.



   These characteristics and others will be explained in detail in the following description of an exemplary embodiment shown in the accompanying drawings which show a key-dialer provided at a subscriber station associated with an automatic office telephone system. exchanges of a type in which the selection operations are controlled by the transmission of a series of pulses corresponding to a designation or number of the requested line. when it is desired to allow the subscriber to establish communications by means of a keypad rather than by operating a dial.



   The keypad transmitter can be used at an attendant position in a private central office system or at a so - called "A" operator position in an automated central office system.



   Figure 1 shows a calling subscriber station circuit and associated keypad or set of keys, the schematic representation of a called line and selector switches for establishing a connection from the calling subscriber line to the line. subscriber line, called, as well as a portion of the pulse sending equipment;
Figure 2 shows another set of relays forming part of the sender; and
Figure 3 shows the recording capacitors and the sender routing relays.

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   For a complete representation of the circuit, Figure 2 should be placed below Figure 1 and Figure 3 below Figure 2, the vertical conductors of these figures being in alignment.



   The keys of the set or keyboard 100 correspond to values of digits from 1 to @ inclusive ment, and feel of a type which does not lock, Des' turnout relays 301 to 309 inclusive, figure 3, are used to connect the Digit recording capacitors 311 to 31B inclusive, one at a time and in succession in order of the keys of the keyboard 100, each capacitor receiving at this time a charge corresponding to the value of the particular digit sent and also serving to connect the capacitors charged one by one and in order to the reservoir capacitor 130 associated with the grid or control electrode 111 of the gas-filled tube 110.

   in order to better understand the invention, the following description gives a detailed description of the establishment of a connection initiated at extension 101 of a calling line, to called line 102; it will be assumed that for this purpose the calling subscriber dials the number 3498 on his keys.



   When the calling subscriber at extension 101 lifts the handset from its switch hook cradle, a ground is connected through the lower contacts of the cradle contact assembly to conductor 103, thereby closing the operating circuit of relay 200 and applying a ground. by the right external contacts of the keys of the keyboard 100; the station loop is closed by the station line circuit to start the line finder 104 for the line search in the usual manner.

   Relay

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 200 in operation establishes a battery circuit through its lower inner contact, conductor 105 and resistor 106 through filament 112 of tube 110; it also establishes a battery circuit through its lowest contact, resistor 201, conductor 202, and from there in series through the upper windings of pulse relays 107 and 108, through resistor 109, conductor 114, the lower middle contact of relay 200 to the battery;

   it establishes a load circuit for the capacitor 2C3, from earth through the capacitor, the inner upper working contact of relay 200, conductor 204 and from there in series through the lower windings of relays 107 and 108 , through resistor 109, conductor 114 to the battery through the lower middle contact of relay 2CO; to its three upper contacts, relay 200 connects a holding earth on conductors 115, 205 and 215 The capacitor 203 charges in the circuit previously described, and the load current passing through the lower windings of the impulse relays 107 and 108 causes them to operate at that moment in order to bring their armatures to their left contacts if they do not find them there. .



   When the subscriber presses the key N 3,116, in order to register the first digit of the called line number taken as an example, a circuit is established from the battery by energizing relay 2C6, the conductor 207, the right contacts of key 116 to ground on conductor 103, and relay 206 operates, establishing a battery circuit through the winding of relay 208, the

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 NC contact of relay 209, the lower NC contact of relay 210, the lower NC contact of relay 206 to earth on conductor 205.

   The relay 208 operates and is blocked in a circuit going from the battery by its winding, the rest contact of the relay 209; the working contact of relay 208, the upper winding of relay 210 to earth on conductor 205, but relay 210 does not work in this blocking circuit since its upper winding is bypassed as long as relay 206 remains actuated. .

   Relay 206 also shunts the 135 volt battery 211 across series resistors 118 to 128 inclusive, of a potential divider associated with keypad 100 through a circuit that runs from the lower terminal of resistor 118 and through the conductor 131 to the positive terminal of battery 211 and the negative terminal of the battery through conductor 212, the upper outer contact of relay 206, conductor 132 at the junction point between resistors 128 and 129. ' The other junction points between the resistors of the potential divider are connected to the left outer contacts of the keys of the keyboard 100.



   With key N 3,116, depressed and relay 206 actuated, a potential is applied to the terminals of recording capacitor 311 from the potential divider.



  The left terminal of capacitor 311 is connected by conductor 212, the upper contacts of relay 206 and conductor 132 at the junction point between resistors 128 and 129, and the right terminal of capacitor is connected by the normally closed contact of the capacitors. switching relay 301 to 304 inclusive, the

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 lower rests of the switch relays 305 to 309 inclusive, the conductor 310, the upper internal contacts of the relay 206, the conductor 117, the left contacts of the key 116 at the junction point between the resistors 121 and 122. The capacitor 311 is thus char 'to a potential equal to the voltage drop across resistors 122 to 128 inclusive or the sbmme of seven increments of potential.



   When the subscriber releases the depressed key 116, the charging circuit to the capacitor 311 is opened at its left contacts and the operating circuit of the relay 206 is opened at its right contacts. Relay 206 then drops back ... opening the slunt around the upper coil of relay 210 which then operates in the blocking circuit of relay 208 and establishes a circuit for routing relay 501, from the battery via the rewinding of relay 301, and thence in series by the lower rest contacts of relay 300 and of the switching relays 302 and 304, in series by the upper resting contacts of the switching relays 306 and 308, the conductor 319, the upper working contact of relay 310 to earth on conductor 205.

   The relay 301 on operation locks in a circuit of the battery through its winding and inside upper working contact, through the conductor 321, the lower normal contacts of the relay 213 to earth on the conductor 215; it opens at its upper rest contact the charging circuit of the recording capacitor 311 described above: it prepares the charging circuit of the recording capacitor 312 for its upper working contact; he prepares for his superior working contact

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 middle a discharge circuit for the capacitor 311; it closes a shunt responsible for the winding of the relay 219 and establishes an operating circuit for the non-normal relay 300.



   The shunt around the coil of the relay 219 goes from the right terminal of the coil of the relay 219 through the conductor 215, the lower normal contacts of the relay 213, the conductor 321, the upper inner and lower inner working contacts of the relay 301 and thence in series interiors through the lower normal contacts of relays 302 to 304, in series through the internal upper normal contacts of relays 305 to 309 inclusive, the conductor 320 to the left terminal of the winding of the relay 219, The operating circuit of relay 300 goes from the battery through the winding and the lower inner normal contacts of the relay 300, the lower middle working contact of the relay 301 to earth on the conductor 215.



   The relay 300, while operating, is blocked by its lower internal contacts alternating with the earth on the conductor 215; it opens the initial operating circuit of the switching relay 301 at its lower rest contact; it connects a ground of conductor 215 through its lower middle make contact, conductor 221, resistor 222 to conductor 202 and thence to the left terminal of the upper winding of pulse relay 107 to initiate operation pulse relays 107 and 108 as will be described later, and connects battery 211 to the pulse small divider comprising resistors 139,140 and 141,

   the positive terminal of the battery 211 being connected by the conductor 131 to the

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 left terminal of resistor 139 and the negative battery terminal being connected through conductor 212, the top contact of relay 300, conductor 229 through resistor 226, and conductor 142 to the right terminal of resistor 141.



   Relay 300 also closes circuits for relays 216 and 217, these circuits passing from the battery through resistor 223, the winding of relay 217 and in parallel of relay 216 from the battery through resistor 224 and. winding / and thence through the normal upper inner contacts / of relay 216, the closed contact of the anode relay 218, the closed contact of relay 219, the conductor 220 and the lower working contact of the relay 300 to the earth on conductor 215.

   Relay 216 operates, but the coil of relay 217 being shunted at this time by the earth applied to the internal upper normal contact of the relay.
216 and by the upper lower NC contact of the relay
217 at the junction point between resistor 223 and the coil of relay 217, relay 216 does not operate at this time.

   The relay 216 while functioning is blocked by its alternating upper interior contacts, the rest contact of the relay
219, the conductor 220, the lower make contact of the relay 300 to earth on the conductor 215, and establish an operating circuit for the relay 225 of the battery by energizing the relay 225, the lower working contact. of relay 216, the lower NC contact of the relay
217 to earth on conductor 215 in order to fulfill functions which will be described later.



   During this time the subscriber pressed another key on the keypad 100 to store the second digit of the number of the desired line. As we have assumed that this second digit was 4, it will insert key N 4 133, and the relay

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 206 will again operate as previously described, and with relays 208 and 210 actuated, will establish an operating circuit for battery relay 209 through the coil of relay 2C9, the lower coil, and the lower NO contact. of relay 210, the lower contact of relay 206 to earth on conductor 205. The relay 209 while operating opens the blocking circuit of the relay 208 previously established through the upper winding of the relay 210,

   relay 208 then drops but relay 210 is kept actuated by its lower coil in series with the coil of relay 209.



   With the relay. switch 301 actuated, operation of relay 206 now applies a potential to the terminals of recording capacitor 312 from the potential divider of the keypad, the lower terminal of capacitor 312 being connected by the upper inner make contact of the relay 300, the conductor 212, the upper contacts of the relay 206, the conductor 132 at the junction point between the resistors 128 and 129, and the upper terminal of the capacitor being connected by the upper working contact of the switching relay 301 , the upper working contacts of the switch relays 302 to 304 inclusive, the lower rest contacts of the switch relays 305 to 309 inclusive, the conductor 310, the inner upper contacts of the relay 206, the conductor 117,

   the left contacts of key 133 at the junction point between resistors 122 and 123.



  The condensate 312 is thus charged to a potential equal to the potential drop across resistors 123 to 128 inclusive, ie with six potential increments.



   When the subscriber releases the pressed key 133, the charging circuit of the capacitor 312 is opened at its contacts.

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 left and the operating circuit of relay 206 is open at its right contacts. Relay 206 then drops out, opening the operating circuit of relay 209 and the blocking circuit of relay 210; these relays then drop, and the relay 210 on falling establishes an operating circuit for the switching relay 302.

   This circuit runs from the battery through the coil of relay 302, the lower make contact of the turnout relay 30, the lower break contact of the turnout relay 303, the upper break contacts of the turnout relays 305 , 307 and 309, conductor 322, the upper rest contact of relay 210 to earth on conductor 205.

   The operating relay 302 is blocked in a circuit going from the battery through its winding and its upper inner working contact, the lower middle working contact of the relay 301 to earth on the conductor 215; it opens at its upper rest contact the charging circuit of the recording capacitor 312 previously defined; it prepares the charging circuit of the recording capacitor 313 for its upper working contact;

   it prepares at its upper middle working contact a discharge circuit for capacitor 312 and establishes a new shunt around the winding of relay 219 going as previously described from the left terminal of relay 219 to the inner lower normal contacts of relay 303, and from there by the lower inner and inner and outer working contacts of relay 3C2, the lower middle working contact of relay 301, conductor 215 to the right terminal of relay 219. The shunt thus followed by relay 219,
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 is established by the operation of relay 301, ebb now open at the lower inner contacts of relay 302.

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   When the subscriber presses key N9, 134, to store the third digit to be 9, relay 206 will operate again and, with relays 209 and 210 now released, relay 208 will operate as described for 1. 'recording of the first digit sent and is blocked by the upper winding of the relay 210 but the winding of the. relay 210 being bypassed, this relay does not work.

   With the switching relay 302 actuated, the operation of the relay 206 then applies a potential to the terminals of the recording capacitor.
313 from the potential divider of the keypad, the lower terminal of the capacitor 313 being connected, by the upper inner working contact of the relay 300, the conductor
212, the upper contacts of relay 206 and the conductor
132 at the junction point between resistors 128 and 129, and the upper terminal of the capacitor being connected by the upper working contact of the switching relay 302, the upper breaking contacts of the switching relays 303 and
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 304 the .ritCts of repDÜ ihrêrieutl of switching relays 3Ô5 to s09: lhcÜil3:

  Í.vement, the conductor 3lty the inner top contacts of relay 206, the conductor 117, the left contacts of the key 134 at the junction point between the resistors 127 and 128. The capacitor 313 is thus charged at a potential equal to the voltage drop across resistor 128 or with a potential increment.



   When the subscriber releases the depressed key 134, the charging circuit of capacitor 313 is opened at its latch contacts and the operating circuit of relay 206 is open at its right contacts. Relay 206 then drops out removing the winding shunt of relay 210 which now operates in the blocking circuit of relay 208 and establishes an operating circuit for the boost relay.

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 guillage 303, of the battery by winding relay 303, the lower working contact of the switching relay 302, the lower reoos contact of the relay 304, the upper rest contacts of the relays 306 and 308, the - tor 319, the upper working contact of relay 210 to earth on conductor 205.

   Pushing relay 303 locks in a circuit from the battery through its winding and upper inside contact, the lower middle working contact of relay 302 to ground on conductor 215; it opens the charging circuit of the recording capacitor 313 at the upper quiescent contact; it prepares the charging circuit of the recording capacitor 314 for its upper working contact;

   it prepares the discharge circuit of capacitor 313 for its upper middle working contact and establishes a new winding shunt of relay 219, which extends as previously described from the left terminal of relay 219 to the lower internal normal contacts of the relay. relay 304, and thence through the lower inner and upper inner work contacts of relay 303, the lower middle work contact of relay 302, conductor 215 to the right terminal of relay 219. The previously established shunt Originator of relay 219 by the operation of relay 302 is now open at the lower inner contacts of relay 303.



   When the child presses the key N 8, 135, to register the fourth zero digit is assumed to be 8, the relay 206 will operate again and, with the relays 208 and 210 actuated, will establish the operating circuit of the relay 2C9 as previously described. The relay 209 by operating opens the blocking circuit of the relay 208 previously established by the upper winding of the relay 210,

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 relay 208 then releases, but relay 210 is kept actuated by its lower winding in series with the winding of relay 209.



   With turnout relay 303 actuated, operation of relay 206 maintains a potential across recording capacitor 314 from the keypad potential divider, with the lower terminal of capacitor 314 being connected by the switch contact. inner upper work of the relay 300, the conductor 212, the upper contacts of the relay 2C6 and the conductor 132 at the junction point between the resistors' 128 and 129 and the upper terminal of the capacitor being connected by the upper working contact of the switch relay 303, the upper NC contact of the switch relay 304, the lower NC contacts of the switch relays 305 to 309 inclusive, the conductor 310, the inner upper contacts of the relay 206, driver 117,

     the left contacts of key 135 at the junction point between resistors 126 and 127i The capacitor 314 is thus charged to a potential equal to the voltage drop across resistors 127 and 128, ie with two increments potentials
When the subscriber releases the depressed key 135, the charging circuit of capacitor 314 is opened at its left contacts and the operating circuit of pelay 2Q6 is open at its right contacts.

   The relay 206 then drops out opening the operating circuit of the relay 209 and the blocking circuit of the relay 210, whereupon these two relays fall back, the relay 210 on falling establishes an operating circuit for the relay. routing 304 of the battery by the winding of relay 304, the lower working contact of the switching relay 303, the upper NO contacts of the switching relays 305, 307 and 309, the conductor 522, the

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 upper rest contact of relay 210 to earth on conductor 205.

   The relay 304 on operation locks in a circuit of the battery by its winding and its upper inner working contact, the lower middle working contact of the relay 303 to earth on the conductor 215; it opens its upper rest contact the charging circuit of the recording capacitor 314; it prepares the charging circuit of the recording capacitor 315 for its upper working contacts;

   it prepares at its upper middle working contact a discharge circuit for the capacitor 314 and establishes a new shunt around the coil of the relay 219 which goes as previously described - from the left terminal of the relay 219 to the normal upper contacts. interiors of relay 305, and thence through the inner work contacts of relay 304, the lower middle work contact of relay 303 and conductor 215 to the right terminal of relay 219: The previously described shunt for relay 219, which was set by operation of relay 303 is now open at the lower contacts of relay 304.



   It will be noted from the foregoing that the relays 208, 209 and 210 operate in rethinking of the operation and release of the relay 206 in such a way that the relay 210 is activated after the end of sending each imoair digit and scitreleased after the end of the sending of each even number.



   All the digits of the line number taken as an example have now been recorded by energizing capacitors 311 to 314 inclusive.



  During this time and as soon as the first digit sent was registered, which was indicated by the operation

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 of the switching relay 301, of the non-normal relay 300, of the relays 216 and 225, the sending of outgoing pulses has been started for the first digit ,. When relay 300 has operated and placed a ground through resistor 222 on the left terminal of pulse relay winding 107, a drive circuit through the upper windings of relays 107 and 1C8 and the resistance 109 was supplemented by conductor 114 and a contact from relay 200 to the battery, and the pulse relays then drew their armatures to their right-hand contacts.

   With relay 225 actuated, a ground is placed from conductor 215 through the upper working contact of relay 225 to the armature of relay 108, and a discharge circuit for capacitor 203 is established from ground to the armature of the relay. 108 by its right contact, the lower windings of the relays 107 and 108, the .conductor 204, the upper internal contact of the relay 200, the capacitor 203 to earth;

   capacitor 205 discharges through circuits At the same time, a ground applied by the armature and the right contact of relay 108 through the upper windings of relays 107 and 108, conductor 202, resistor 222, denducer 221 and the lower middle contact, from relay 300 to earth on conductor 215, short-circuits the upper windings of relays 107 and 108. With their upper windings short-circuited, relays 107 and-108 have their lower windings traversed by the discharge current of the capacitor 203 in a direction such that these relays attract their armatures on their left contacts.



   When the armature of relay 108 leaves the right contact, the shunt around the upper windings of relays 107 and 108 is open and these windings are energized.

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 again and the previously described capacitor 203 charging circuit is established again. As the relays 107 and 108 are differentially wound, the flux established by the excitation of their upper windings is opposed to the flux established by the charge current of the capacitor 203 passing through their lower windings. When the load current through their lower windings is low, the upper windings take advantage and the relays 107 and 108 bring their armatures to their right contacts.

   In this way, the relays 107 and 108 continue to transfer their armatures from their right contacts to their left contacts at a speed determined by the charge and discharge times of the capacitor 203, or at a speed determined by the best operating conditions. transmission of selectors setting pulses.



   The relay 225 while operating, in addition to controlling the operation of the pulse relays 107 and 108, opens at its upper rest contact a discharge circuit through the resistor 138 for the reservoir capacitor 130; it closes a shunt around resistor 126 by its lower inner work contact;

   it connects the positive terminal of the battery 211 through the winding of the anode relay 218, the lower working contact in the middle of the relay 225, the lower closing contact of the relaia 227 and the conductor 228 to the anode 113 of the tube 110 and rings the notential divider comprising the resistors 139, 140 and 141 without putting the resistor 226 in series, at the terminals of the battery 211, the left terminal of the resistor 139 being connected by the conductor 131 to the terminal positive of battery 211, and the right terminal of resistor 141 being connected by conductor 142, the lower contact

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 inside relay 225, conductor 229, upper contact of relay 300, conductor 212 to the negative terminal of battery 211,

   
At the first operation of the armature of the pulse relay 107 to the right; a shunt is established around the normal right-hand contacts of relay 154, and when relay 1C7 again draws its armature to the left, this shunt is open but has no effect since relay 154 has not yet operated. and consequently the line loop which passes through the conductors 136 and 137 to the line relay (not shown) of the first selector 143 is not opened in order to advance the first selector vertically.



  When pulse relay 108 for the first time draws its armature to its left contact following operation of relays 216 and 226, a circuit is established to actuate battery relay 227 through the coil. start of relay 227, the lower break contact of relay 230; the upper NO contact of relay 216, the conductor 231, the left contact of the impulse relay 108, the upper NO contact of the relay 25 to ground on the conductor 215.

   Relay 227 when operating locks in a series circuit with the winding of relay 230, the upper working contact of relay 227, the lower working contact of relay 225, ground on conductor 215, but the relay 230 does not work in this blocking circuit as long as pulse relay 108 maintains its armature on its left contact. Relay 227 also closes a circuit for relay 144 from earth to conductor 103 through the winding of the relay 144, the conductor 145, the lower working contact of the relay 227 to the battery, and the relay 144 operates to open the receiver circuit of the subscriber station.

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 born while sending impulses.



   When relays 107 and 1C8 draw their armatures back to their right-hand contacts, the shunt around the coil of relay 230 is opened by relay 108, and relay 230 operates in the blocking circuit of relay 227 and establishes the Battery relay 154 operating circuit through the winding of relay 154, conductor 146, inner upper NO contact of relay 230, upper NO contact of relay 217 to earth on conductor 215.

   Relay 154 when operating opens the shunt around the contacts of peak pulse relay 107 and establishes a conductor pulse loop / 157 through the right side alternating ccntacts of relay 154, the right contact of pulse relay 107 , to the ring conductor 136 to prepare the sending of pulses, and to its left external contacts it establishes a new circuit to apply a positive potential to the anode 113 of the tube 110 which replaces the circuit previously described by the contact relay 227. This circuit runs from the positive terminal of battery 211 through the winding of relay 218, the lower middle contact of relay 225, conductor 232, the left outer contacts of relay 154 through the 'anode 113.



   With the relay 230 actuated, a circuit is established from the grid 111 of the tube, through the resistor 148, the reservoir capacitor 130, the normal contacts of the key 149, the conductor 239, the upper working contact of the. relay 230, the conductor 233, the upper normally closed contact of the switching relay 301, the capacitor 311, the upper contact of the relay 300, the conductor 229, the lower internal working contact of the relay 225, the conductor 142, resistors 141 and 140 of the adjustable earth-pulse potential divider, which connects the capacitor

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 tank discharged in series with register capacitor 311 which is assumed to be charged with seven potential increments.



   Upon subsequent operation of the armatures of pulse relays 107 and 18 which come to their left contacts, relay 107 opens the pulse send loop to transmit a pulse to the first selector switch 143, and the relay 108 establishes a circuit of the earth by its armature and its left contact, the conductor 231, the upper working contact of relay 216, the lower working contact of relay 230, the conductor 234, the winding of the relay. secondary pulse 147 and resistance 150 to the battery.

   Relay 147 is operating and at its right-hand make contact establishes a holding circuit for battery relay 154 through the winding and inside left-hand make contact of relay 154, the right make contact of relay 147 to earth on conductor 115, and at its left working contacts establishes a charging circuit for the transfer cond densator / 151 of the positive terminal of the battery 211, through the conductor 131, the external left working contact of the relay 147 , the resistor 152, the capacitor 151, the inside left working contact of the relay 147, the conductor 212 at the negative terminal of the battery 211.



  Capacitor 151 is of such a capacity that it now charges to a potential substantially equal to a potential increment previously applied during dialing on the terminal keypad of recording capacitor 311.



   As soon as the pulse relays '107 and 18 move
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 armrings their new. "'r +" "() R on the right, relay 10" i again closes the pulse sending loop for

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 terminate the first transmitted pulse and the relay 108 opens the operating circuit of the secondary pulse relay 147 which drops out, opening the charging circuit of the transfer capacitor / 151 and connecting this capacitor by its working contacts of left in parallel with the capacitor-reservoir 130. The capacitor 151 then discharges into the condensate 130, raising the potential of the latter by one increment.

   For successive operations of the armatures of the pulse relays 107 and 108, first on their left contacts then on their right contacts, the impulse envci loop is open and closed and the secondary impulse relay 147 is actuated and released to charge capacitor 151 and discharge it in capacitor 130 When relay 107 has thus opened and closed the pulse sending loop three successive times and relay 108 has operated and released three Once pulse relay 147, 3 increments of potential will have been applied to reservoir capacitor 130 and at this time, the total potential across capacitors 130 and 311 will be 10 increments.

   This total potential applied to the grid 111 quera, of the tube 110 prsvo the discharge of the tube, which will establish a discharge circuit through the tube to the capacitors 130 and 311 from the cathode 112 grounded to the grid 111 through resistor 148, capacitor 130, and thence as described, through a recording capacitor 311 through the top contact of relay 300, lead 229, the bottom inner contact of relay 225, lead 142, through resistors 141 and 14C:

   from the potential divider to earth and will establish a conductive circuit through the tube from the cathode to the ancestor, This last circuit goes from the earth through the cathode-anode soatial path of the tube and from there

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 through the winding of the anode relay 218 to the positive terminal of the battery 211 and the negative terminal, from the battery through the conductor 212, the upper contacts of the relay 300, the conductor 229, the lower inner contact of the relay 225, conductor 142, resistor 141 to earth at the adjustable point on resistor 140.



   Relay 218 operates, establishing a circuit from the junction point between the winding of the secondary pulse relay and resistor 15C through the right normally closed contact of relay 147, conductor 153, the open contact of relay 218, the break contact of relay 219, conductor 220, lower working contact of relay 300 to earth on conductor '215 to bypass the winding of relay 147 and thus prevent further operation of this relay during following closings of the left contact of the impulse relay 108) the relay 218, with its rest contact opens the shunt previously established around the winding of the relay 217.

   Relay 217 then operates, covering at its upper break contact the circuit of relay 154 which then falls back to bypass the pulse contacts of pulse relay 107, thus rendering subsequent operation of pulse relay 107 inefficient at transmitting pulses to the first selector 143; at its lower NC contact, it opens the relay circuit, 225 which then drops out and closes a circuit for relays 214 and 213 in parallel with the battery through resistor 235, the coil of relay 213, and from the battery through resistor 236, the winding of relay 214, and thence through the normal contacts of relay 214, the lower working contact of relay 217 to ground on conductor 215.



   Relay 214 operates by the circuit described above and locks on its alternating earth contacts

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 on the conductor 205, but the relay 213 being shunted by an earth applied from the conductor 215 by the lower contacts of the relay 217 and its own upper rest contact at the junction point between its winding and the resistor 235 does not does not work as long as relay 217 remains activated.

   Releasing relay 225, at its upper rest contact, closes the shunt resistor around reservoir capacitor 130 to completely discharge this capacitor; at its upper make contact, it removes an earth from the armature of the pulse relay 108, thus stopping the subsequent operation of the pulse relays 107 and 108; with its inner lower contact, it removes the shunt of resistor 226; at its lower middle contact, it opens the cathode-anode circuit through the tube, thus stopping the discharge of the tube and releasing the anode relay 218, and at its lower contact, it opens the blocking circuits of relays 227 and 230 which then fall back. Relay 227 on falling again releases relay 144 to again close the subscriber plague receiver circuit.



   The relay 218 by releasing the shunt of the winding of the secondary impulse relay 147 and in its quiescent contact establishes a shunt circuit to release the relay 216, this circuit going from the ground to the conductor 220, by the reset contact of relay 219, the repcs ccntact of relay 218, the upper internal working ccntact of relay 217 at the function point between the winding of relay 216 and resistor 224. Relay 216 then returns closing a circuit maintenance for the battery relay 217 through resistor 223, the winding of the relay 217, the upper internal contacts of the relay 216, the renos contact of the relay 218, the contact

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 repcs of relay 219, to earth on conductor 220.



  With relay 217 actuated, an operating circuit for relay 225 is reestablished from the battery - by winding up relay 225, the lower NC contact of relay 216, ¯ the lower inner NO contact of relay 217 to earth on the conductor 215. The relay 225, when operating, again removes the shunt of the reservoir capacitor
130, connects earth to the armature of pulse relay 108 to cause intermittent operation of relays 107 and 108 as previously described, reconnects positive terminal of battery 211 through the winding of anode relay 218 to the anode of tube 110 and shunt resistor 226 again,
As soon as the impulse relay 108 engages its left contact, a circuit is established from earth to its armature by the left contact,

   the conductor 231, the upper repcs contact of the relay 216, the upper working contact of the relay 217, the conductor 234 by the winding of the relay 147 and the resistor 150 to the battery, and the relay 147 operates to close the circuit of previously loaded dice. crit, for capacitor 151.

   On the next operation of the armature of the relay 108 to come on its contact, on the right, the relay 147 drops off and, as previously described transfer capacitor 151 in a discharge path going to the reservoir condenser 130. As relay 108 continues to operate, capacitor 151 is alternately heated and discharged in capacitor 130 until the potential across capacitor 130 reaches the discharge potential of tube 110. ;

   the tube then discharges, establishing a discharge circuit for capacitor 130 from earth on cathode 112 through tube on grid 111 and thence through resistor 148, capacitor 130,

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 the normal contacts of the key 149, the conductor 239, the upper normally closed contact of the relay 230, the conductor 238, through resistor 140 to earth and establishes the cathode-anode circuit through the tube again energizing the relay d As of 218. The time required to raise the potential on the grid of tube 110 to the discharge value of the tube provides sufficient time to give the first selector 143 time to complete its row search.



  During this interval, since relay 154 is not energized, repeated operation of pulse relay 107 has no effect.



   When the anode relay 218 operates, it bypasses relay 147 again in its unactuated state and opens the blocking circuit of relay 217 which then drops out, opening with a lower contact the shunt around the coil of the relay. 213 thus allowing the operation of the relay 213 and opening the circuit of the relay 2.27 which then drops Releasing the relay 225 restores the discharge shunt circuit around the capacitor 130, removes the earth from the armature of the pulse relay 1C8 to stop the function - nement of the pulse relays 107 and 108, and opens the cathode-anode circuit through the tube 110 to switch off the tube and release the anode relay 218.



   Releasing relay 218 removes the shunt from the secondary impulse relay 147 winding and establishes a circuit to activate the earth relay 216 again through conductor 220, / the rest contact of the relay. 219, le1, repcs ccntact of relay 218, the normal contacts and the winding of relay 216, through resistor 224 to the battery,

   With relay 216 activated and relay 217 released

 <Desc / Clms Page number 25>

 the previously described operating circuit for relay 225 is established and relay 225 operates again to remove the shunt from capacitor 130 to restart pulse relays 107 and 108 and to connect the positive terminal of battery 211 across. the winding of the anode relay 218 to the anode of the tube When the armature of the relay @ the first time 1st time
108 comes / on its left contact with relays 216 and
225 now actuated) the circuit of relay 227 is established from the battery by the winding of relay 227, the lower NC contact of relay 230, the upper NO contact of relay 216, conductor 231, left contact of relay
108,

   the upper working contact of relay 225 to ground on conductor 215, and relay 227 operates, again establishing the operating circuit of relay 144 and closing for itself a previously described blocking circuit which passes through the winding of relay 230. The relay
23G operates in this blocking circuit as soon as pulse relay 108 opens its left contact, causing relay 154 to operate again, which in turn makes the pulse contacts of relay 107 effective to transmit pulses to the second switch. selector 155.



   The relay 213 while operating opens at its lower transfer contacts the holding circuit of the switching relay 301 which then drops out and establishes a new wax. referral. for relay 302 replacing the holding circuit previously described by the lower middle NC contact of the switching relay 301, The new holding circuit for relay 302 goes from the battery through the winding and the upper working contact inside relay 302, conductor 323, the lower alternating contacts of relay 213 to earth on the

 <Desc / Clms Page number 26>

 conductor 215. The release of the switching relay 301 disconnects the recording capacitor 311 from the pulse counting device and associates the recording capacitor 312 with it.



   With relay 230 actuated, a circuit is established from grid 111 of the tube through resistor 148, capacitor 130, normal key contacts 149, conductor 239, upper NO contact of relay 230, conductor 233, the upper middle NC contact of the switching relay 301, the upper middle working contact of the switching relay 302, the capacitor 312, the upper contacts of the relay 300, the conductor 229, the contact internal working pressure of relay 225, conductor 142, resistors 141 and 140 to ground on resistor 140, capacitors 130 and 312 thus being connected in series.



   When the armatures of the pulse relays 107 and 108 then come to their left position, the relay lC7 opens the pulse sending loop to transmit a pulse to the second selector 155 and the relay 108 establishes the circuit previously described. by the lower NO contact on relay 216, the lower NO contact on relay 23C, and conductor 234 to operate the relay. secondary pulse 147 which closes the charging circuit of capacitor 151.

   When the armatures of relays 107 and 108 come back to their right-hand contacts, relay 107 closes the pulse sending loop to terminate the first transmitted pulse and relay 108 opens the circuit of relay 147 which then drops out. and connects the capacitor 151 in a discharge circuit passing through the capacitor 130. When the armatures of the pulse relays 107 and 108 successively first come to their position

 <Desc / Clms Page number 27>

 left then their right pcsiticn, the pulse sending loop is open or closed and relay 147 is actuated and released to charge capacitor 151 and discharge it in capacitor 130.

   After relay 107 has thus opened and then closed the pulse loop four times and relay 108 has actuated and released relay 147 four times, 4 increments of potential will have been applied to the capacitor. 130 and the total potential across capacitors 130 and 312 will be 10 increments at this time since capacitor 312 has been assumed to be charged 6 increments.

   This total potential applied to the grid 111 of the tube will cause the tube to discharge. Establishing a discharge path for capacitors 130 and 312 between the cathode and the grid as previously described, and establishing a conductive circuit through the tube. tube from cathode to anode as previously described with anode relay 218 actuated in this circuit.



   Relay 218 by operating again bypassing relay 147 in its de-energized position and at its closed contact opens the shunt around the coil of relay 217. Relay 217 now operates, opening the relay circuit to its upper idle contact. 154 which then falls back to bypass the pulse contacts of relay 107, which makes the subsequent operation of pulse relay 107 ineffective for transmitting pulses to the second selector.

   At its lower idle contact, relay 217 also opens the circuit of relay 225 which then drops out and connects a ground of conductor 215 through its lower working contact, the upper working contact of relay 213 to the junction painted in- - be resistor 236 and the winding of relay 214 on

 <Desc / Clms Page number 28>

 which relay 214 is bypassed and drops out.



   Releasing the relay 225 closes the discharge shunt around the capacitor 130 in order to completely discharge the latter, removes the earth from the armature of the pulse relay 108 in order to stop all operation of the pulse relays 107 and 108. , opens the cathode-anode circuit through the tube thus turning off the tube and releasing the node relay 218 and opens the blocking circuits of the relays 227 and 230 which drop out as a result. Relay 227 on releasing releases relay 114 on scn tcur. Relay 218 on releasing removes the shunt from the looping of impulse relay 147 and at its break contact establishes a shunt circuit to de-energize relay 216 as described below. above.

   With the relay 216 released, the relay 217 is blocked actuated in the circuit previously described by the rest contact of the anode relay 218. And the relay 225 is again activated by the circuit previously described which passes through the contact of lower rest of relay 216 and the lower inner working contact of relay 217
The relay 225 when operating again removes the shunt of the capacitor 130; it connects a ground to the armature of the pulse relay 108 so that the relays 107 and 108 operate intermittently again and reconnects the positive terminal of the battery 211 through the winding of the relay 218 to the anode of the tube.

   As soon as the impulse relay 108 comes to its left contact, with the relay 216 de-energized and the relay 217 energized, the relay 147 is actuated to close the charging circuit previously described for the capacitor 151. At the next operation of the armature of relay 108 on the drcite, relay 147 drops out and ¯as previously described connects

 <Desc / Clms Page number 29>

 the capacitor 151 in a discharge circuit going to the reservoir capacitor 130.

   As the relay changes
108 continues to operate, the capacitor 151 is / natively charged and discharged in the capacitor 130 until the potential across the capacitor 130 reaches the discharge potential of the tube 110 and the tube then discharges establishing a path. discharging for the capacitor 130 from cathode 112 to grid 11 as previously described and establishing the cathode-anode circuit through the tube to re-actuate anode relay 218.



   The time required to bring the potential on the grid of the tube to the discharge value thus provides sufficient time to give the second selector 155 time to perform its row search function. During this time, due to the fact that relay 154 is not actuated, the repeated operation of relay 107 has no effect:

   ,
When the anode relay 218 operates again, it bypasses relay 147 in the non-actuated position and opens the blocking circuit of relay 217 which then drops out, opening at its lower contacts the blocking circuit of relay 213 which drops out and opening the circuit of relay 225 which also drops. Relay 225 on falling establishes a shunt circuit around the capacitor
130 to discharge it completely, removes the earth from the armature of the impulse relay 108 to stop the operation of impulse relays 107 and 108 and opens the cathode-anode circuit of the tube thus extinguishing the tube and releasing ' thus the anode relay 218.



   Relay 218 on releasing removes the shunt of pulse relay 147 and establishes the circuit previously described to actuate relay 216 again.

 <Desc / Clms Page number 30>

 relay 216 actuated and relay 217 released, the previously described circuit is established for relay 225 which functions again to remove the shunt of capacitor 130, to resume intermittent operation of pulse relays 107 and 108 and to reconnect the Terminal from the positive battery relay 211 through the winding / anode 218 to the anode of the tube.

     When the armature of the pulse relay 108 comes into contact with its left contact for the first time, with the relays 216 and 225 actuated, the relay 227 is energized again, blocks through the winding of the relay 230 as previously described and restores the excitation circuit previously drawn for relay 144.

   Relay 230 operates in the circuit / blocking of relay 227 on the next operation on the right contact of impulse relay 108, would cause the operation of relay 154 which makes the contacts of impulse relay 107 active. lice transmit
 EMI30.1
 pulses to the switch / & KMipl56
The relay 213, by releasing the blocking circuit of the switching relay 302 at its transfer contacts, which then restarts and establishes a new holding circuit for the switching relay 3C3 to replace the holding circuit previously described by the switching contact. lower middle work of the 3C2 switch relay.

   The new hold circuit for relay 303 runs from the battery through the coil and inside top work contact, the inside top contact contact of turnout relay 301, conductor 321, ncrmal contacts. of the relay 213 to earth on the conductor 215. The release of the switching relay 302 disconnects the recording capacitor 312 from the metering device associated with it pulses and the recording capacitor 313.

 <Desc / Clms Page number 31>

 



   With the relay 230 actuated, a circuit is established from the grid 111 of the tube, through the resistor 148, the capacitor 130, the normal contacts of the key 149, the conductor, 239, the upper working contact of the relay 230, the conductor '255, the upper middle NC contacts of ± switching relays 301 and 302, the upper middle working contact of the switching relay 303, the capacitor 313, the upper contact of the relay 300, the conductor 229, the lower inner working contact of relay 225, conductor 242, resistors 141 and 140 to earth to connect capacitors 130 and 313 in series.



   When the armatures of the pulse relays 107 and 108 next come to the left, the relay 107 opens the loop of outgoing pulses to transmit a pulse to advance the connector switch 156 vertically one step and the relay 108 sets the The circuit previously described by the upper working contact of relay 216 and the lower working contact of relay 230 to actuate pulse relay 147 which closes the charging circuit of capacitor 151.

   When the armatures of relays 107 and 108 then come to the right, relay 107 again closes the pulse sending loop terminating the first pulse transmitted to its / to connector 156 and relay 108 opens the circuit of relay 147 which now drops and connects capacitor 151 in a discharge circuit passing through capacitor 130. For successive operations of the armatures of pulse relays 107 and 108 first on the left then on the drcite, the loop of pulse send is opened and closed and relay 147 is actuated and released to charge capacitor 151 and discharge it in capacitor 130.

   Once relay 107 has thus opened or closed the pulse-sending loop nine times, and the

 <Desc / Clms Page number 32>

 relay 108 has energized and released relay 147 nine times, 9 increments of potential will have been applied to capacitor 130 and at that time the total potential across capacitors 130 and 313 will be 10 increments, since it has been assumed that the capacitor 313 was charged with a potential increment: This tctal potential applied to the grid 111 of the tube will prevent the discharge of the tube establishing a discharge circuit for the capacitors 130 and 313 between the cathode and the grid as previously described, and establishing a conductive circuit through the tube from the cathode to the anode as previously drawn, the anode relay 218 operating in this circuit.



   Relay 218 by operating again bypass relay 147 in its de-energized position, and its normally closed contact opens the shunt around the coil of relay 217. Relay 217 now operates, opening the circuit to its rest contact. relay 154 which then releases to bypass the contacts of impulse relay 107 thus rendering ineffective the subsequent operation of impulse relay 107 to transmit impulses to connector 156, to its lower repcs contact opening the circuit of the relay 225 which drops out and connecting a ground of conductor 215 through its lower make contact, the normal contacts and the coil of relay 214 through resistor 236 to the battery, on which relay 214 operates.



   Relay 225 on releasing closes the discharge shunt around capacitor 130 to fully discharge it, removes ground from the armature of pulse relay 108 to stop further operation of pulse relays 107 and 108, opens cathode-anode circuit through

 <Desc / Clms Page number 33>

 the tube) consequently extinguishing the tube and releasing the anode relay 218, and opens the blocking circuit of the relays 227 and 230 which then drop; Relay 327 by releasing in turn releases relay 144, Relay 218 by releasing removes the shunt from the winding of the impulse relay 147 and in its quiescent contact establishes a shunt circuit to de-energize the relay 216 as previously deurit .

   With relay 216 de-energized, relay 217 blocked actuated in the circuit previously described by the closed contact of anode relay 218 and relay 225 is again actuated by the circuit previously described by the lower closed contact of relay 216 and the lower inner make contact of relay 217; .

   Relay 225 when operating again removes the shunt of capacitor 130, connects a ground to the armature of pulse relay 108 so that relays 107 and 108 operate intermittently again, and reconnects positive battery 211 through the winding from anode relay 218 to the tube anode. As soon as the impulse relay 108 comes on its gaudhe contact with the relay 216 de-energized and the relay 217 energized, the relay 147 is actuated to close the charged circuit previously described for the capacitor 151. When the armature of the relay 108 then comes to the right, relay 147 drops out and as previously described connects capacitor 151 in a discharge path going to reservoir capacitor 130.



  As relay 108 continues to operate, capacitor 151 is alternately charged and discharged so that capacitor 130 until the potential across capacitor 130 reaches the discharge potential of the tube; the casing then lights up, establishing the discharge circuit

 <Desc / Clms Page number 34>

 as previously described for the capacitor 130 through the tube from the cathode to the grid and establishing the cathode-anode circuit of the tube to again actuate the anode relay 218. A delay was thus provided during which, since the relay 154 is not actuated, repeated operation of the pulse relay 107 has no effect.



   When the anode relay 218 operates again, de-energizing it bypasses relay 147 in position 1 and opens the blocking circuit of relay 217 which then drops back, opening at its lower contact the shunt around the winding of relay 213 which operates then, and opens the circuit of relay 225 which also drops out. Relay 225 on falling re-establishes the discharge shunt for capacitor 130, removes ground from the armature of pulse relay 108 to stop operation of pulse relays 107 and 108, and opens the cathode-anode circuit of the capacitor. tube, thus shutting down the tube and de-energizing the anchor relay 218.



   Relay 218 on de-energizing removes the shunt from the winding of pulse relay 147 and establishes the circuit previously described to actuate relay 216 again; with relay 216 actuated and relay 217 released, a previously described circuit is established for relay 225 which operates again, removes the shunt of capacitor 130, causes intermittent operation of pulse relays 107 and 108, and reconnect the positive terminal of battery 211 through the winding of anode relay 218 at the tip of the tube. When the armature of impulse relay 108 first comes on its left contact, with relays 216 and 225 now actuated, relay 227 is actuated and locks through the coil of relay 230 restoring the circuit. of relay 144.

   The

 <Desc / Clms Page number 35>

 relay 230 operates in the blocking circuit of relay 227 as soon as pulse relay 108 opens its left contact) causing relay 154 to operate again which then makes the pulse contacts of pulse relay 107 effective for transmitting pulses in order to horizontally advance by rotation the connector 156.



   Relay 213, while operating, opens at its transfer contacts the blocking circuit of the turnout relay 303 which then drops out and establishes a new hold circuit for the turnout relay 304 to replace the hold circuit. previously passing through the lower middle NO contact of the switching relay 303, The new holding circuit of the relay 304 goes from the battery through the winding and the upper working contact inside this relay, the inner upper normally closed contact of the switching relay 302, the conductor 323, the alternating contacts of the relay 213 to earth on the conductor 215.

   Releasing the switching relay 303 disconnects the recording capacitor 313 from the pulse counting device and associates the recording capacitor 314 with it.



   With relay 230 actuated, a circuit is made from grid 111 of tube 110 through resistor 148, capacitor 130, normal key contacts 149, conductor 239, upper normally closed contacts of relay 230 le. conductor 233, the upper middle rest contacts of the switching relays 301 to 303 including the upper middle contact of the switching relay 304, the capacitor 314, the upper contacts of the relay 300, the conductor 229, the internal working contact bottom of relay 225, conductor 142, resistors 141 and 140

 <Desc / Clms Page number 36>

 to earth, which connects capacitors 130 and 314 in series.



   When the armatures of the pulse relays 107 and 108 then move to the left, the relay 107 opens the pulse sending loop to transmit a pulse in order to advance the connector switch 156 by one step. , and relay 108 establishes the circuit previously described by the upper working contact of relay 216 and the lower working contact of relay 230 to operate impulse relay 147 which closes the transfer circuit blocking capacitor 151 , When the armatures of relays 107 and 108 then come on the drcite,

     relay 107 closes the pulse sending loop to terminate the first pulse and relay 108 opens the circuit * of relay 147 which returns and connects capacitor 151 in a charging circuit through capacitor 130 For successive operations of the armatures of the pulse relays 107 and 108, first on the left then on the right, the pulse sending loop is opened and closed and the relay 147 is actuated and released for load. manage the capacitor 151 and discharge it in the capacitor 130.

   After relay 107 has thus opened and closed the pulse-sending loop eight times and relay 108 has actuated and released relay 147 eight times, 8 potential increments will have been applied to capacitor 130 and The total potential across capacitors 130 and 314 will then be 10 increments, since it has been assumed that capacitor 314 was charged with 2 increments of potential.

   This total potential applied to the grid 111 of the tube will cause the tube to discharge, establishing a discharge circuit for the capacitors 130 and 314 between the cathode and the grid as previously described and

 <Desc / Clms Page number 37>

 establishing a conductive circuit through the tube from the cathode to the anode as previously described, the anchor relay 218 operating in this circuit.



   The relay 218 while operating, shunts the relay 147 again in its non-actuated position, and at its rest contact opens the shunt around the winding of the relay of 217. The relay 217 'now operates, opening on its own. upper quiescent contact the circuit of relay 154 which then releases to bypass the impulse contacts of relay 107 thus rendering ineffective the subsequent operation of impulse relay 107 to transmit impulses to connector 156, opening to its lower NC contact the circuit of relay 225 which then drops out and connecting a ground of conductor 215 through its lower NO contact, the upper NO contact of relay 213 at the junction point between resistor 236 and the winding of relay 214 on which relay 214 is bypassed and falls out,

   
The relay 225 on releasing closes the discharge shunt around the capacitor 130 to discharge it completely, removes the earth from the armature of the pulse relay 108 in order to stop the operation of the pulse relays 107 and 108,. Opens the circuit. cathode-anode through the tube, thus turning off the tube and releasing the anode relay 218, and opens the blocking circuits of the relays 227 and 230 which then drop out. Relay 227 on falling in turn releases relay 144. Relay 218 on falling removes the shunt from the winding of the impulse relay 147 and at its break contact establishes a shunt around the winding of the relay 216 as before. describes what relay 216 drops off.

   With the relay 216 deactivated, the relay 217 is blocked activated in the circuit previously described which passes through the rest contact of the relay 218, and the relay

 <Desc / Clms Page number 38>

 225 is again actuated by the previously described circuit which passes through the lower NC contact of relay 216 and the lower inner NC contact of relay 217.



   The relay 225 on operation removes the shunt of the capacitor 130, again begins the operation of the pulse relays 107 and 108 and reconnects the pc-positive terminal of the battery 211 through the winding of the anode relay 218 to the tube anode. As soon as the impulse relay 108 comes on its left contact, with the relay 216 de-energized and the relay 217 activated, the relay 147 is actuated to close the load circuit previously described for the capacitor 151.

   When the armature of relay 108 then comes to the right, relay 147 drops out and as previously described connects capacitor 151 in a discharge circuit going to capacitor 130, as relay 108 continues to operate, the cendensor 151 is alternately charged and discharged in the capacitor 130 until the potential across the capacitor 130 reaches the discharge potential of the tube 110 onto which the tube discharges establishing the discharge circuit previously described for the capacitor 130 through the tube from the cathode to the grid, and establishing the cathode-anode circuit through the tube to again actuate the anode relay 218.

   A delay time has thus been ensured during which, since relay 154 is not actuated, repeated operation of pulse relay 107 has no effect.



   As the connector switch 156 has now been set to the terminals of the requested line 102, the connector begins to test whether the line is free or busy, to return a busy signal if the line is busy or to apply a ringing current if

 <Desc / Clms Page number 39>

 the line is free. If the line is free and the called subscriber answers, ringing current is removed from the line and a talk circuit is established in calling plague 101 at called line 102.



   When the anode relay 218 operates, it bypasses relay 147 again in its de-energized position and opens the blocking circuit of relay 217 which then drops out, opening at its lower contact the blocking circuit of relay 213 which drops in turn, and opening the circuit of relay 225 which also drops. Relay 225 on falling re-establishes the discharge shunt for capacitor 13C, stops the operation of pulse relays 107 and 108 and opens the cathode-anode circuit of the tube thus shutting down the tube and releasing the anode relay 218 .



   Releasing relay 213 opens at its transfer contacts a blocking circuit of the 3C4 switching relay of the battery through the winding and the upper working contact inside the relay 304, the upper repcs contact. - inside the switching relay 302, the conductor 323, the contacts of the relay 213 to the earth on the conductor 215 and, since it was assumed that only four digits were sent by the subscriber and that consequently the routing relay 305 was not actuated, there is now no effective shunt around the coil of the relay 219;

      cerelais 219 operates accordingly by a circuit from the battery through the winding and the lower inner make contact of the turnout relay 304, and thence through the upper normal inner contacts of the turnout relays 305 to 309 inclusive. , the conductor 320, the winding of the relay 219 to earth on the conductor 215.



  At its contacts, the relay 219 when functioning removes the earth

 <Desc / Clms Page number 40>

 of the armature of the anode relay 218, and the anode relay as well - 218 when falling cannot effect the excitation of the relays
216 and 225 and operate pulse relays 107 and 108.



   When the calling subscriber puts his handset back on the cradle, the earth is removed from the conductor 103, thus releasing the start relay 200 which then removes the earth from the conductor.
215 thus de-energizing all the operated relays of the sender, in this case, the routing relay 304, the out-of-normal relay
300 and relay 219.



   If the subscriber after sending the first digit had waited, as at this time the 301 referral relay had worked and was blocked under the control of the ccntacts
300 lower points of relay 213; the out-of-normal / relay had operated and stalled and the winding of relay 219 was bypassed by the lower normal contacts of the relay
213, the inner upper NO contact of relay 301, normal ccntacts:

   inner lower contacts of the turnout relays 302 to 304 inclusive, the internal upper normal contacts of the turnout relays 305 to 300 inclusive, and the conductor 320, - then as soon as the sequence of pulses for the first digit recorded in capacitor 311 is over and the next time interval has been. assured, the relay 213 is actuated as previously described.



   With no further turnout relays actuated, operating relay 213 now opens the shunt around the coil of relay 219, whereby relay 219 operates in series with turnout relay 301 in a circuit from the battery through the winding and the inner lower working contact of relay 301, and thence through the normal contacts of the other switch relays, the conductor 320, the winding of the relay 219 to ground on the

 <Desc / Clms Page number 41>

 driver 215.

   Relay 219 on operation removes ground from the armature of anode relay 219 to prevent operation of relays 214 and 225 which prevents subsequent transmission of pulses.
When the next digit is sent and the turnout relay 302 operates, the winding of the relay., 219 is again shorted by the conductor $ 21, the lower middle NO contact of the relay 301, the NO contacts interiors of relay 302 and thence as described, to driver '320; relay 219 then drops off and the sending of pulses is recommenced in the manner previously described.



   An analogous circuit condition occurs whenever the sender has transmitted the pulses of all digits handled by the subscriber.



   From the foregoing description, it is clear that the relay pairs 216, 217 and 213, 214 act as count relays; relay 216 operating before sending any pulses; , series of figures, the relay
217 operating at the end of sending pulses; relay
216 releasing before the start of the interval following sending and the relay 217 dropping at the end of this interval.



   Relay 214 operates at the end of sending pulses of each series of odd digits, relay 213 operates at the end of the next time interval, relay 214 drops out at the end of sending pulses for each series of even numbers and relay 213 drops out at the end of the next time interval.



   It should be noted that eight recording capacitors 311 to 318 inclusive have been represented and that if a line number comprises more than eight digits, the switching relay 308 will be activated according to the load of the recording capacitor 318 for the eighth digit sent. during the

 <Desc / Clms Page number 42>

 release the key pressed and will lock while preparing a charging circuit for the recording capacitor 311.



  This capacitor which was used to record the first digit sent will at this time cause pulses to be sent for the first digit and will be discharged. If now the subscriber sends a ninth digit, the operation of relay 206, with relay 210 not being actuated, will cause as previously described the operation of relay 208 and apply a potential to the terminals of recording capacitor 311 from the divider. keypad pctential, the left terminal of capacitor 311 being connected by the upper NO contact of relay 300, conductor 212, upper contacts of relay 206,

   the conductor 132 at the junction between the resistors 128 and 129 and the right terminal of the capacitor 311 being connected by the lower working contact of the switching relay 308, the lower breaking contact of the switching relay 309, the conductor 31b ; the upper internal contacts of relay 206; the conductor 117, the left contact of the key pressed for the ninth digit at the junction point between two resistors of the potential divider of the keyboard which will charge the capacitor 311 to a potential determined by the value in digits of the key pressed.



   When the subscriber releases the key engaged, the charging circuit of the capacitor 311 is opened and the relay 206 is released whereupon the relay 210 fcnctnnates in the blocking circuit of the relay 2C8 as previously described and establishes a circuit for the relay. switch 309 of the battery through the winding of the relay 309, the upper working contact of the relay 308, the conductor 319, the upper working contact of the relay 210 to earth on the conductor 205.

   The relay 309, while operating, gets stuck in a

 <Desc / Clms Page number 43>

 circuit of the battery through its winding and its lower internal make contact, the upper middle working contact of relay 308 to earth on the conductor 215 opens at its lower break contact the charging circuit for the recording capacitor 311 previously described jpré. shields the discharge circuit of capacitor 311 at its lower middle make contact and establishes a new shunt around the coil of relay 219, which extends as previously described from 1 (left terminal of relay 219 through conductor 320 , the internal working contacts of relay 309, the.

   upper middle NO contact of relay 308, lead 215 to the right terminal of relay 219, No provision is made to store more than nine digits although it is clear that circuits can be easily adapted for this purpose.



   The provision for allowing nine digits to be registered is of particular use when circuits are installed on a subscriber line of an attached private central office; In such an installation, the subscriber would have to send a first digit to access an outgoing line to a central office and would then have to wait before sending the digits of the number of a desired subscriber line until qu he received a line dial tone from the central office. Establishing the connection to the central office returns the first recording capacitor 311 to its normal discharged condition as previously described.

   Having received the line tone from the central office, the subscriber would then begin sending the digits of the desired line number which
May consist of seven digits to reach the subscriber line and an eighth digit to indicate the desired extension on the line if the called subscriber is on a common line.

 <Desc / Clms Page number 44>

 



  The first seven digits of the row number would be recorded on capacitors 312 through 318 inclusive and the eighth digit would be recorded on capacitor 311 as previously described.



   If it is necessary to replace the tube or to check the adjustment of the tube in use, key 149 is first operated.



  Operation of this key will connect the battery through its alternate top contacts to the tube filament circuit and will connect both the keypad potential divider and pulse potential divider to the 211 battery terminals. potential divider of the keyboard is connected by the conductor 131 to the positive terminal of the battery 211 and the junction point between the resistors 12 8 and 129 of this potential divider is con- nected by the alternate lower contacts of the key 149 and lead 212 to the negative terminal of battery 211.



  The left end of the pulse potential divider is connected by conductor 131 to the positive terminal of battery 211, the negative terminal of which is connected by conductor 212, the contacts alternating above the lower contacts of the key. 149 and conductor 142 to the right terminal of the pulse potential divider. To its inner upper alternating contacts, key 149 connects the grid. from tube 110 through resistor 148 through the upper rest contacts of relay 225 and resistor 138 to a test position on the keypad potential divider between resistors 119 and 118.



   Once key 149 has been operated for at least one second, a test key 237 is operated, which connects the positive terminal of battery 211 through the winding of anode relay 218, the contacts of the key

 <Desc / Clms Page number 45>

 237, the rest contact of relay 227 and conductor 228 at the anode of the tube. The potential applied to the grid will cause the discharge of the tube and if the tube is thus a conductor, an indication will be given by the function of the anode relay 218 or by the blue glow inside the tube. It can then be turned off by releasing olé 237.

   If the tube is not conductive, the set point on resistor 140 of the pulse potential divider will need to be shifted until the tube (becomes on-lead .. The correct setting will be at the point where a minimum variation in the potential divider will separate the functioning and non-functioning of the tube when the olé 237 is pressed * Once the adjustment is complete, the two keys 149 and 237 are released.



   Although the invention has been described in the case of a particular exemplary embodiment, it is clear that it is in no way limited thereto but is, on the contrary, susceptible to numerous modifications and adaptations without departing from it. of his domain.



   CLAIMS.



   1 - Control system for a discharge device in a gas atmosphere having a defined discharge potential, characterized in that it includes: a first capacitor; means for placing a variable load on this capacitor; a second capacitor; means for oonneotating these capacitors in series in a circuit across the discharge device in a gaseous atmosphere; a third capacitor; a charging circuit for this third capacitor;

   and means for char-! manage by degrees the second capacitor by connecting the third capacitor alternately in its charge circuit and in parallel with the second capacitor, the discharge device in a gaseous atmosphere becoming conductive when the sum of the charges on the two first capacitors reaches the discharge potential of this device.

** ATTENTION ** end of DESC field can contain start of CLMS **.


    

Claims (1)

2 - System for checking and recording digits, <Desc / Clms Page number 46> or characters, as claimed in 1, characterized in that the first capacitor serves as a digit recorder and in that the means for charging the third capacitor are controlled by a pulse generator system so as to charge the second capacitor according to the number of pulses included in a train of pulses, means being provided for terminating the train of pulses and operating when the conduo -teur discharge device in a gas atmosphere becomes conductive by discharging under the action of the first and second condensing eu rs. 3 -Equipment for controlling and recording digits or characters as claimed in 2, characterized in that it comprises a series of first capacitors each arranged to serve as number recorders and a system arranged to oonneot each of them. said first capacitors in turn to the discharge circuit of the discharge device in a gaseous atmosphere. 4 - Equipment for controlling and recording digits or characters as claimed in 3, characterized in that in order to control both the transmission of the digits and the intervals between the digits, the second capacitor is charged by devices pulse generator, and is connected in the discharge circuit of the gas discharge device in series with the first capacitor to control the transmission of the digits, and alone to control the interval between the digits. 5 - Equipment for control and recording of figures or characters as claimed in 4, characterized in that the control device is provided to modify the discharge potential of the discharge device in a gaseous atmosphere between the control of transmission of a digit and the control of a period between digits. <Desc / Clms Page number 47> ABSTRACT. The invention relates to a system of E! control for a discharge device in a gas atmosphere having a defined discharge potential. This system comprises: a first capacitor; means for placing a variable load on this capacitor; a second capacitor; means for oonnote these capacitors in series in a circuit across the discharge device in a gas atmosphere; a third capacitor; a charging circuit for this third capacitor; and means for gradually charging the second oondensator by rotating the third capacitor alternately in its charging circuit and in parallel with the second capacitor, the discharge device in a gaseous atmosphere becoming conductive when the sum of the charges on the first two capacitors reaches the discharge potential of this device.