GB555688A - Signalling and communication systems - Google Patents

Signalling and communication systems

Info

Publication number
GB555688A
GB555688A GB6996/42A GB699642A GB555688A GB 555688 A GB555688 A GB 555688A GB 6996/42 A GB6996/42 A GB 6996/42A GB 699642 A GB699642 A GB 699642A GB 555688 A GB555688 A GB 555688A
Authority
GB
United Kingdom
Prior art keywords
current
tube
cathodes
anode
battery
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
Application number
GB6996/42A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB555688A publication Critical patent/GB555688A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/62—Two-way amplifiers
    • H03F3/64—Two-way amplifiers with tubes only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/40—Cold-cathode tubes with one cathode and one anode, e.g. glow tubes, tuning-indicator glow tubes, voltage-stabiliser tubes, voltage-indicator tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0064—Tubes with cold main electrodes (including cold cathodes)
    • H01J2893/0065—Electrode systems
    • H01J2893/0067—Electrode assembly without control electrodes, e.g. including a screen

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

555,688. Telephone transmission systems. STANDARD TELEPHONES & CABLES,Ltd. May 22, 1942, No. 6996. Convention date, March 26, 1941. [Class 40 (iv)] [Also in Group XL] A communication circuit is opened and closed by means of a cold cathode tube which when ionized by the application of anode potential from a bridged source provides a low impedance path for speech currents across its cathodes. Fig. 1 shows the application to a cord circuit with the cathodes 105, 106 interposed in one leg and the anode 107, battery 108 and a switch S in a bridge circuit, which may include a choke coil to exclude alternating current therefrom. The tube acts as a current limiter, since if the signal current at any time equals the total current that can flow in the anode current one cathode will lose all its current. Fig. 3 shows a symmetrical arrangement, while Fig. 5 shows a modification employing a tube with 3 cathodes for interconnecting 3 circuits. In Fig. 4, the battery 126 is supplemented by alternating current from an oscillator 127, and a trigger anode connected to a battery 133 is provided. All the three switches shown must be closed to ionize the tube. The tube is filled with gas such as neon, argon or helium at a pressure of a few millimetres to a few centimetres of mercury, and the cathodes may be arranged as shown in Figs. 6-9.
GB6996/42A 1941-03-26 1942-05-22 Signalling and communication systems Expired GB555688A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US385231A US2294910A (en) 1941-03-26 1941-03-26 Signaling and communication system

Publications (1)

Publication Number Publication Date
GB555688A true GB555688A (en) 1943-09-02

Family

ID=23520567

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6996/42A Expired GB555688A (en) 1941-03-26 1942-05-22 Signalling and communication systems

Country Status (2)

Country Link
US (1) US2294910A (en)
GB (1) GB555688A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1071765B (en) * 1952-04-10 1959-12-24 !international· Standard Electric Corporation!, New York, N. Y. (V. St. A.) Circuit arrangement for rental facilities. I.
DE958577C (en) * 1954-01-19 1957-02-21 Siemens Ag Set up at manually operated switchboards
US2796558A (en) * 1955-10-24 1957-06-18 Ibm Indicator device

Also Published As

Publication number Publication date
US2294910A (en) 1942-09-08

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