US1579999A - Cable telegraphy - Google Patents

Cable telegraphy Download PDF

Info

Publication number
US1579999A
US1579999A US596467A US59646722A US1579999A US 1579999 A US1579999 A US 1579999A US 596467 A US596467 A US 596467A US 59646722 A US59646722 A US 59646722A US 1579999 A US1579999 A US 1579999A
Authority
US
United States
Prior art keywords
impulses
relay
contact
tape
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US596467A
Other languages
English (en)
Inventor
George R Benjamin
Angel Herbert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Union Telegraph Co
Original Assignee
Western Union Telegraph Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Western Union Telegraph Co filed Critical Western Union Telegraph Co
Priority to US596467A priority Critical patent/US1579999A/en
Priority to DEW62975D priority patent/DE467278C/de
Priority to NL23636A priority patent/NL14031C/xx
Priority to FR561507D priority patent/FR561507A/fr
Priority to GB9022/23A priority patent/GB205783A/en
Application granted granted Critical
Publication of US1579999A publication Critical patent/US1579999A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/46—Transmitting circuits; Receiving circuits using tuning forks or vibrating reeds

Definitions

  • This invention relates to telegraph systems wherein the sending apparatus is automatically controlled by a code perforated tape and the receiving apparatus controls a printer, the sending and receiving apparatus being automatically maintained in synchronism.
  • This system is especially intended for use over ocean cables but it may also be operated on land lines,
  • the main object of this invention is to provide an organization of apparatus and method of operation which will facilitate the transmission of messages and increase the output or carrying capacity of cables over existing systems.
  • the signal impulses sentover an ocean cable are very much attenuated at the receiving end owing to its impedance and capacity and the cable must therefore be operated more slowly than land lines, the signal impulses being proportionately longer. If the current impulses are too short or are sent into the cable too rapidly, they will be practically absorbed, or lost and will not reach the receiving end.
  • We take advantage of this condition by transmitting single code unit impulses at such a high rate of speed that they will not affect the relay at the receiving end and consequently single impulses will produce no effect at the distant end of the cable, while, impulses having a duration of two or more single impulses will actuate the cable relay.
  • Figure 1 illustrates an organization of apparatus embodying our invention at the transmitting station
  • Fig. 2 shows apparatus for carrying out our invention at the receiving station
  • Fig. 3 is a fragmentary perspective view of a portion of the tape transmitter
  • Fig. t is a diagram illustrating the impulses corresponding to certain code characters as they would be sent out or received by different parts of the apparatus.
  • the signals are sent out atthe transmitting station A by an automatic transmitter T, which is actuated by a La Cour motor or phonic wheel controlled by a vibrating reed or fork in the 'well known manner, such a device being illustrated in U. S. patents to Murray No. 670,964 and Yorke & Benjamin No. 1,298,622. We have therefore merely indicated a phonic'whecl P ⁇ V connected to the driving shaft 10 of the transmitter.
  • the tape 12, which has been previously perforated with the code message is fed as usual across the table or plate 15 having a series of holes through which the pins 14 project as they are allowed to move upwardly in succession against the tape.
  • ⁇ Ve have shown the transmitter provided with live pins and the tape perforated with five unit code characters but other codes may be employed.
  • the pins are attached at their lower ends to levers 16 pivot-ally mounted at 17-and urged upwardly by springs 18. These levers are normally held down by a corresponding set of control levers 20 mounted on the pivot rod 21 and yieldingly held downwardly by sprlngs 23.
  • pole changer PC which may oscillate between contacts 30 and 31, connected respectively to the plus and minus poles of a battery, is carried by an upwardly extending lug on the table 32, pivoted at 17 and yieldrately by the respective levers.
  • each code character is in alinement-across the tape, perpendicular to the longitudinal axis of the tape. Inasmuch as the tape moves continuously, whilethe five pins are moved in sequence,
  • each pin it is necessary that the pins should be arranged in staggered relation, each pin being advanced ahead of the preceding pin by an amount equal to the distance, which the tape travels during the time between the actuation of successivepins. Hence, if there were five perforations in any code character each pin would rise at just the proper instant to enter the corresponding perforation. It will be apparent that instead of arran ing the pins in staggered relation, the perforations 1n the tape might be staggered and the pins could then be in alinement at right angles to the tape.
  • the continuously rotating cams 25 actuate the control levers 20in sequence and permit the corresponding levers 16 to lift the pins 14 whenever there are corresponding perforations in the moving tape 12.
  • a marking impulse is thereby transmitted from the positive pole through contact 30, pole changer PC, conductor 36, contacts 38, 39, conductor 40 and transmitting relays -12, 4-3 to return.
  • the armature of marking relay 43 therefore swings over against its right hand contact, thereby transmitting a positive impulse from cable battery 45 into the cable C.
  • the duration of this impulse is determined by the length of the cams or unbroken portions of the periphery of the curbing disk 47, carried by the transmitter shaft 10, the spaces or notches between the cams permitting the contacts 38, 39 to separate and break the circuit through conductor 40, thus allowing the armature of. relay 43 to return to its back contact and thereby earth the cable for a part of the signal.
  • the percentage of curbing may be changed by substituting cam disks having slots or notches of a different length.
  • a local record is produced simultaneously by a circuit from the pole changer PC through conductor 50, contacts 51,52 and conductor 54 leading to a siphon recorder, indicated conventionally at 56.
  • the block impulses sent from the transmitter T may be broken up into their component unit code impulses and may be curved to any desired amount. by means of the curbing disk 58, the duration of the impulses transmitted to the recorder SR being determined by the length of the cams or unbroken peripheral portions of the disk while the notches determine the amount of curbing by permitting the contacts 51 and 52 to sepa rate and break the circuit through conductor 50.
  • the tape (30 is thus clamped between the armature and pole piece of magnet 63 and as the magnet is simultaneously moved forward on the bracket 64 carried by the core 65 of the solenoid, the tape will be momentarily pulled or dragged forward a short distance at the instant between the operation of the fifth pin and the first pin, that is, between successive code characters.
  • the receiving end of the cable, station B may be equipped with the usual drum relay indicated conventionally by the suspended coil 100 carrying the contact arm 101 which swings to one side or the other of the revolving drum 102 to connect the relay 105 or 106 with the local battery 108.
  • the distributer D which controls the current ii'npulses sent into the Selecting magnets 1, 2, 3, 1, 5 of the printer P, is actuated intermittently by a pawl and ratchet mechanism.
  • the five contacts carried by the levers (Z (Z (P, d", cl are moved in sequence into contact with the five corresponding contacts (1 by a series of spirally arranged cam lugs 109 on the shaft 110. the shaft being moved intermittently as the pawl 112 is moved back and forth over the ratchet 114 by the magnet 115.
  • the siphon recorder 50 is connected to a double throw switch 111, so that it may be connected in shunt to the resistance 13% in the line 120 to receive the signals as they come in over the cable or may be shunted across the resistance 137 to receive the impulses regenerated by the operation of the relay PR and sent into the printerby the fork TF.
  • the printing operation requires a certain time period and in all prior systems employing a single channel circuit, a definite portion of the line time is assigned for this purpose, which is necessarily subtracted from the transmitting time and is therefore a positive loss.
  • the line may be in use the full time, the impulses of succeeding code characters following each other without intermission.
  • the speed of the transmitter T is determined by the rate of vibration of the tuning fork which controls the phonic wheel PlV operatively connected to the driving shaft 10 of the transmitter.
  • This fork must perform two functions during the time of the reception of one 1111- pulse by the relay at the receiving end of the cable. It will be remembered that single impulses of unit length have no effect upon the receiving relay and that impulses of double length are received as single ii'npulscs of substantially unit length. During this unit period the fork must first prepare tl.e circuit to a printer selecting magnet and then step the distributor to a new position in time to receive the next succeeding impulse. 1
  • the actuating magnet is controlled by a make and Lil break contact located directly on the fork, in the manner shown in the patents previously mentioned.
  • a make and Lil break contact located directly on the fork, in the manner shown in the patents previously mentioned.
  • the vibrations on the c0ntrary,-we maintain the vibrations by remote control, utilizing the received signals to vibrate the fork and also to maintain it in phase with the sending transmitter.
  • the cable relay CR at the receiving end is actuated by transmitted impulses having a duration of at least two unit code impulses.
  • a marking impulse When a marking impulse is received, the contact pointer 101 swings over the lower part of the drum 102, causing the armature of the marking relay 105 to move to its right-hand contact and connect minus battery to conductor 120, thereby causing the armature of printer relay PR to move against its markin contact M, the armature of the fork controlling relay FR, remaining against its S contact.
  • a'spacing impulse is received by the cable relay, its pointer 101 swings to the opposite side of the drum 102, thereby causing the armature of spacing relay 106 to swing against its right hand contact, thus connecting plus battery to conductor 120. This throws the armature of printer relay PR against its spacing contact S and the armature of fork relay FR against its marking contact M.
  • the tape 12 has been perforated with code characterscorresponding to the letters AS and is being fed through the transmitters T.
  • the first two pins 14 will pass in sequence through the holes on the marking side of the tape corresponding to the first two impulses in letter A, and will cause the polechanger PC to swing over against contact 30 connected with plus battery.
  • the platform 32 does not drop between successive pins, the succeeding pin or pins maintaining it elevated. Accordingly, the pole-changer PC is held against contact 30 for a double unit period.
  • a block impulse equal to two single unit impulses, as indicated at 4 would therefore be transmitted over the conductor 36 I to the relays 42 and 43, except for the action of the curbing disk 47which permits the contacts 38,39 to separate between successive block impulses.
  • the duration of each impulse is determined by the length of the unbroken portions of the periphery of the disk 47, which maintain the contacts 38, 39
  • the double length marking impulses are received by the drum relay CR at the receiving end of the cable as single impulses of substantially unit length and cause the contact arm 101 to swing to the lower portion of the drum 102 thereby throwing the armature of marking relay 105 against its right hand contact, thus connecting conductor to minus battery.
  • This energizes winding of printer relay-PR in a manner to throw the armature against its marking stop M.
  • the tine f will engage the contacts and 131 twice while the armature of the relay PR remains against its stop M and likewise the tine f will close the contacts 132, 133 twice during the same period.
  • magnet 1 of printer P is energized through a locking circuit from minus battery 135, coil 0 and armature of overlap relay OR, conductor 154, lever (1 and con-, tact (Z to plus battery.
  • the overlap locking relay is itself energized -through a circuit from minus battery 135, coil 0' of the relay OR, contact lever (l, the first contact (t conductor 13G, armature of rela)' PR, resistance 13?. contact 130, time 7" and the condenser K.
  • the minus charge on the condenser K is discharged through tine 7', contact 131, conductor 138 and coils 126 of printer relay PR.
  • N o etl'ect is produced on the armature of relay PR since the magnetic cfi'ect of the coils 125 predominates over that of coils 120.
  • the. tine f closes a circuit through conductor H0 which energizes magnet 115 and steps the distributor forward a half tooth insuring a firmer contact between (i and the corresponding contact (1 which were made to engage when tine f left contact 133 at the completion of the first impulse of the letter A.
  • magnet 2 of the printer is energized from minus battery 135 through contact lever II as the tine f engages the contact 130.
  • the signal impulse through the coils 125 of 'relay PR terminates at the In this manner, although but one impulse was received by the cable relay CR, two impulses have been sent into the printer in proper sequence to energize its magnets 1 and 2.
  • a record is made upon the tape of the siphon recorder SR by connecting its actuating coils, indicated conventionally at 56, across a portion of the resistance 137.
  • a zero space between consecutive code characters is produced by means of a cam lug 109 which lifts the lever (i against the contact (Z just after the fifth impulse of each character, closing a circuitthrough conductor 75 which energizes the magnet 63 and solenoid (37 momentarily, the action being identical with that previously described in regard to the siphon recorder SR located at the transmitting station.
  • the third, fourth and fifth impulses of the letter A are non-selecting or spacing impulses and consequently are not perforated in the tape. Accordingly the third, fourth and fifth pins of the transmitter T will not be permitted to rise and the pole changer PC will remain against contact 31. thereby causing spacing relay 42 to send t-h 'ee unit minus impulses into the cable C, w iich will be received at the cable relay CR as a block signal of three unit period.
  • the receiving cable relay swings its contact arm 101 to the upper side of drum 102 too late for the third impulse but in time to receive the fourth and fifth impulses.
  • the third, impulse is supplied by the operation of the fork, in the manner previously explained, and the fourth and fifth imulses are provided by the cable relay, therey energizing spacing relay 106 and connecting conductor 120 to plus battery.
  • the tines of the tuning fork TF will engage contact 130 three times, but the printer selector magnets 3, 4 and 5 will not be energized because the circuit from minus battery 135 remains open at the contact. M of the printer relay.
  • the stepping magnet 115 is energized by the closing of the contacts 132, 133 so that the distributer shaft is stepped forward a tooth corresponding to each of the three spacing impulses after which the printing magnet 118 is energized as the contact lever d is raised against its contact cl, thereby completing the cycle of operations for the letter A,
  • the letter S which has been assumed to follow the letter A consists in the code character of three single impulses, positive, negative and. positive, followed by two negative impulses. These-are sent into the cable by the transi'nitter as indicated at P, but inasmuch as the first, second and third impulses are single unit impulses of opposite sign, they produce no effect upon the receiving cable relay CR and its pointer 101 remains in zero position over the central insulating band of the drum 102. These missing impulses are, however, supplied or interpolated by the apparatus at the receiving station B in the following manner :The armature or tongue of printer relay PR was swung againstits S contact by the last signaling impu se of the letter Amid the condenser K accordingly received a.
  • the tine f closes the contacts 132, 133 thereby energizing the magnet 115, and when tine f leaves contact 133, thus dcenergizing magnet 115, it steps the distributor around one notch to disconnect contact arm d and simultaneously lift contact arm (l against its corresponding contact at", thus preparing a circuit for selecting magnet 3 of the printer in advance of the next impulse.
  • the condenser K discharges a positive current through the windings 126 of relay PR, causing its tongue to swing over to its M contact, whereby when tine f swings to contact 130, an energizing current flows through printer selecting-magnet 3 from minus battery 135 to condenser K.
  • the fourth and fifth impulses of the letter S are minus or non-selecting impulses and are sent out from the transmitter T as a single impulse of double length, as indicated in the diagram 1, and are transmittted tothe cable in the same manner by the spacing relay 42. Since the receiving cable relay OR is affected by impulses of double length, it pointer 101 will swing to the spacing side of the drum 102, arriving there too late for the fourth impulse but in time to receive the fifth impulse. In this case the fourth impulse is furnished by the fork just as in the case of the second impulse, while the fifth impulse is provided by the cable re ay, thereby causing relay 106 to connect conductor with plus battery, thereby causing relay PR to be held over to its spacing contact for the fourth and fifth impulses.
  • the impulse producer circuit from minus battery 135, through conductor 136 to condenser K is continuously sending impulses of current of opposite sign to the preceding linecurrcnts, through the windings 126 of the printer relay PR- but that these impulses only function to control the operation of the relay when the cable relay pointer is at zero position i. e. during periods when single impulses are sent out by the transmitter T because the windings ofsaid relay are so designed that current in the winding overpowers current in the winding 126.
  • the fork relay FR has its tongue swung to its M contact whenever the conductor 120 is connected to plus battery by the reception of a non-selecting or spacing impulse.
  • the fork magnet receives an energizing impulse from plus battery 151 through conductor 152, contact M and tongue of relay FR to condenser K
  • This impulse is in phase with an impulse sent out by the transmitter T and consequently causes the magnet 150 to produce a pull upon the fork tines at just the proper instant to maintain the vibrations in synchronism and in phase with the transmitter.
  • An energizing impulse is sent through the fork magnet 150 each "ne a spacing impulse is received by the ablerelay CR.
  • Ve have found that this is sufficient to maintain the fork vibrations in synchronism and proper phase relat l OH with the transmitter, when its natural period of vibration has been properly adjusted to the same rate. ⁇ Ve have further found that the fork will continue to vibrate during the intervals betweensuccessive impulses produced by the actuating magnet 150. This method of the remote control of the vibrations of the tuning fork has proven successful in actual practice.
  • a pivoted lever which is normally positioned above the transmitter levers 16 and which may be brought into engagement therewith to prevent any upward movement by means of the magnet 161.
  • the central lever is permitted to move upwardly into a notch provided for that purpose.
  • a lever 162 is thereby permitted to drop into a slot in the table 15 and thereby cause the lever 163 to close the contacts 16-1, thereby energizing magnet 161 and throwing the lever 160 down upon .-the transmitter levers 16.
  • the cams 25 of the transmitter continue to rotate, the third lever and pin rise during each period [corresponding to a code character while the other four pins remain depressed.
  • a signal will, therefore, be repeated continuously into the cable corresponding to the spacing combination in the printer code, namely, No. 3 marking and Nos. 1, 2, 4. and 5 spacing.
  • This combination maintains the sending and relll) DCving apparatus in synchronism and in addition serves to space the tape in the printer at the receiving end.
  • the operator may quickly step the distributer up until it is in phase by manipulating the key 119.
  • Ve have described this system as applied. to a single channel but it will be apparent to engineers that it may be used in a multiple channel system.
  • a multiplex transmitter may be employed or the transmitter T may be provided with two or more groups of actuating cams 25.
  • the receiving distributer D may be equipped with one or more additional sets of levers and cooperating contacts connected to different printers.
  • the receiving equipment may be advantageously employed on land lines in which all oflthe transmitted impulses are received by the receiving relay. In some cases, in Working on land lines, the curbing may be omitted, the block signals from the transmitter being sent directly to line.
  • a tape-controlled transmitter comprising a plurality ofreciprocable pinsadapted to pass in sequence through the tape perforations representing code characters, pole changing means connected tothe transmitting circuit and arranged to effect a circuit change upon the reciprocation of any of said pins and means for actuating said pins in succession comprising a series of cams, a shaft carrying said cams and a uniform speed motor operatively connected to said shaft.
  • a tape-controlled transmitter comprising a plurality of reciprocable pins adapted to pass in sequence through the tape perforations representing code characters, the pins and perforations being staggered relatively to each other, single pole changing means actuated by the operation of any of said pins, and means operating continuously at a uniform speed to reciprocate said pins in unbroken succession.
  • a tape-controlled transmitter comprising a plurality of reciprocable pins adapted to pass in sequence through the tape perforations representing code characters, pole (hanging means connected to the transmitting circuit and arranged to effect a circuit change upon the reciprocation of any of said pins, means for actuating said pins in succession comprising a series of cams, a-
  • said circuit breaker comprising a diskcarried by said shaft and having a notched periphery, and a contact brush bearing upon said periphery, the position of the not/'hes determining the points of curbing of the signal impulses and the intermediate unbroken peripheral portions determining the duration of the impulses to be sent to line.
  • a transmitting apparatus and a receiving equipment comprising a line relay, a printer including selecting magnets and a cooperating vdistributer, a vibrated fork provided with a synchronizing actuating magnet controlled by the impulses of the code characters, a fork relay controlling the impulses passing into said actuating magnet, and a printer relay controlling the impulses passing to the printer, said line relay controlling the operation of said fork relay and said printer relay.
  • a transmitting appa'atus operated at a uniform rate of speed
  • a receiving equipment comprising a printer mechanism.
  • a distributer controlling the circuits of the selecting niagnets of the printer, and a reed or fork vibrated synchronously with the transmitting apparatus at a multiple of the. 'ate 'of speed thereof, said fork controlling the operating mechanism of the distributer and causing the marking impulses to be transmitted to the selecting magnets of the printer corresponding to each unit current impulse of the transmitter.
  • the receiving equipment having a receiving relay responding only to current impulses having a duration of two or more code unit impulses.
  • a tape-controlled transmitter means for continuously driving said transmitter at a uniform speed, a relay at the receiving end of the line, a printer having selecting devices and an associated distributer, a printer relay responsive to current impulses received by said line relay, the armature of said printer relay controlling successively the circuits leading to the respective selecting magnets of the printer, a vibrating reed 01' fork actuated by current impulses corresponding to the impulses received by said line relay, said fork being adjusted to operate synchronously with the transmitter at a multiple of the rate of speed thereof, and contacts coacting with the fork to control circuits leading to said armature and to a mag net operating to advame said distributer step by step, said transmitter being operated at such a speed that. the cable receiving relay will not respond to impulses having a duration equal to one unit code impulse but will respond to impulses equal to two or more unit code impulses.
  • a transmitter means for operating the same at such a rate of speed that im, ulses of unit code length have no effect at t 1e distant end of the line, a receiving line relay responsive to impulses having a duration of two or more of said transmitted unit impulses, a translating mechanism provided with a series of selecting magnets corresponding to the unit impulses of the code characters, a controlling polarized relay for said translating mechanism having two sets .of actuating coils, one set responding to the impulses received by the line relay, said polarized relay having an armature controlling an energizing circuit for said translating mechanism, a.
  • a synchronous telegraph system comprising a transmitter arranged to transmit successive impulses of like sign as single block impulses, translating mechanism embodying selecting magnets for respectively receiving in sequence impulses corresponding to each unit impulse of the code characters, a vibrating reed or fork having an actuating magnet energized periodically by the code current impulses received by the line relay, said fork being adjusted to vibrate at twice the rate of the transmitter and operating to interpolate and to supply to said selecting magnets all of the marking impulses of the transmitted messages and to maintain the translating mechanism in synchronism with the transmitter.
  • a transmitter means associated with the transmitter for setting up a combination corresponding to a special code character whenever the code message tape is withdrawn and causing said character to be transmitted repeatedly and until a tape is inserted in the transmitter.
  • a tape-controlled transmitter having a plurality of reciprocable pins adapted to pass in sequence through the tape perforations representing code characters, means for continuously operating the transmitter at a uniform rate of speed, and means actuated by the removal of the tape from the transmitter for locking certain of the pins against movement while permitting one or more pins to operate in the usual manner, whereby a. definite signal is transmitted repeatedly when there is no tape in the transmitter.
  • a tape-controlled transmitter having a plurality of reciprocable pins adapted to pass in sequence through the tape perforations representing code characters, a pole changer which is actuated to send an impulse to line as each pin passes through a perforation, and an electro-magnetically controlled locking device which is actuated by the withdrawal of the tape to lock certain of the pins while permitting one or more pins to operate, whereby a definite signal is repeatedly transmitted when there is no tape in the transmitter.
  • a ta )G-COII- trolled transmitter having a plurality of reciprocable pins adapted to pass in se quence through code perforations arranged transversely of the tape, said pins being positioned in staggered relation, each pin being in advance of its predecessor a distance equal to the travel of the continuously moving tape during the interval between the o oration of successive pins, and a polec anger comprising a pivoted contact arm lit nuance connected to the transmitting conductor and adapted to contact with one or the other of two contacts connected to the respective poles of a current source, said arm normally engaging one of said contacts and being moved to engagement with the other com tact upon the passing of any one of said pins through a perforation in the tape.
  • tape recording mechanism having auxiliary means operating to clamp the tape and quickly pull the tape after each character to thereby introdnce an extended zero space orseparation between adjacent characters on the tape.
  • a tape-controlled transmitter means for locally recording the signals sent out at the transmit? ting station, comprising tape recording mechanism operatively connected to receive impulses sent out by the transmitter and means operatively connected with the transmitter for curbing to any desired extent the impulses transmitted to said recording mechanism,
  • a transmitting apparatus including a printlng apparatus operatlng 1n synchronism with the transmitter, a local recording mechanism operatlvely-connected to receive the incoming signals, and auxiliary means associated with said recording mechanism and controlled lay the printing apparatus to clamp the tape and quickly pull the tape of said recording mechanism after each character to thereby introduce an extended zero space between adjacent characters,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Common Mechanisms (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US596467A 1922-10-23 1922-10-23 Cable telegraphy Expired - Lifetime US1579999A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US596467A US1579999A (en) 1922-10-23 1922-10-23 Cable telegraphy
DEW62975D DE467278C (de) 1922-10-23 1923-01-23 Drucktelegraphenanlage, bei der Sendeapparat automatisch durch ein gelochtes Band gesteuert wird
NL23636A NL14031C (de) 1922-10-23 1923-01-24
FR561507D FR561507A (fr) 1922-10-23 1923-01-27 Perfectionnements aux systèmes télégraphiques
GB9022/23A GB205783A (en) 1922-10-23 1923-03-29 Improvement in cable telegraphy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US596467A US1579999A (en) 1922-10-23 1922-10-23 Cable telegraphy

Publications (1)

Publication Number Publication Date
US1579999A true US1579999A (en) 1926-04-06

Family

ID=24387384

Family Applications (1)

Application Number Title Priority Date Filing Date
US596467A Expired - Lifetime US1579999A (en) 1922-10-23 1922-10-23 Cable telegraphy

Country Status (5)

Country Link
US (1) US1579999A (de)
DE (1) DE467278C (de)
FR (1) FR561507A (de)
GB (1) GB205783A (de)
NL (1) NL14031C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465507A (en) * 1945-01-16 1949-03-29 Bell Telephone Labor Inc Intercommunicating teletypewriter system
US2501592A (en) * 1946-07-26 1950-03-21 Bell Telephone Labor Inc Intercommunicating teletypewriter system
US2820520A (en) * 1954-01-30 1958-01-21 Det Store Nordiske Telegraf Se Machine for converting telegraphic characters

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL172654B (nl) * 1951-11-01 Pfizer Werkwijze ter bereiding van een geneesmiddel met bronchi-verwijdende werking, werkwijze ter bereiding van daarin toegepaste pyrimidine-verbindingen, alsmede gevormd geneesmiddel.
DE1096101B (de) * 1956-08-29 1960-12-29 Siemens Ag Lochstreifenabtastvorrichtung
DE2951586A1 (de) * 1979-12-21 1981-07-02 Skf Kugellagerfabriken Gmbh Waelzlager fuer laengsbewegungen einer welle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465507A (en) * 1945-01-16 1949-03-29 Bell Telephone Labor Inc Intercommunicating teletypewriter system
US2501592A (en) * 1946-07-26 1950-03-21 Bell Telephone Labor Inc Intercommunicating teletypewriter system
US2820520A (en) * 1954-01-30 1958-01-21 Det Store Nordiske Telegraf Se Machine for converting telegraphic characters

Also Published As

Publication number Publication date
FR561507A (fr) 1923-10-23
GB205783A (en) 1924-09-29
DE467278C (de) 1928-10-25
NL14031C (de) 1925-12-15

Similar Documents

Publication Publication Date Title
US2046328A (en) Facsimile printing telegraph system and apparatus
US1943475A (en) System for selective calling of telegraph stations
US1579999A (en) Cable telegraphy
US2116549A (en) Telegraph system
US2131322A (en) Telegraph signaling apparatus
US2347831A (en) Communication system
US2371311A (en) Station selection system
US1912183A (en) Transmitter for automatic telegraph systems
US2052677A (en) Telegraph system and apparatus
US2498700A (en) Teleprinter exchange system
US1936956A (en) Combined perforating and printing mechanism
US1343256A (en) Selectively-operated circuit-controlling device
US2238136A (en) Auxiliary telegraph signal transmitter
US2549796A (en) Telegraph code translator system
US1771446A (en) Regenerative telegraph repeater
US1367735A (en) Amos f
US1815786A (en) Printing telegraph control circuit
US1631976A (en) Signaling
US2370445A (en) Supervisory signal system
US2262014A (en) Teletypewriter transmitting and receiving system
US1703152A (en) Selective system and apparatus
US1793700A (en) Signaling system and apparatus therefor
US2336910A (en) Telegraph transmitter
US1542779A (en) Tape transmitter
US1927699A (en) Telegraph system