GB503758A - Improvements in or relating to electric signalling systems - Google Patents

Improvements in or relating to electric signalling systems

Info

Publication number
GB503758A
GB503758A GB2680137A GB2680137A GB503758A GB 503758 A GB503758 A GB 503758A GB 2680137 A GB2680137 A GB 2680137A GB 2680137 A GB2680137 A GB 2680137A GB 503758 A GB503758 A GB 503758A
Authority
GB
United Kingdom
Prior art keywords
relay
signal
operate
rectified
frequency
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
GB2680137A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2680137A priority Critical patent/GB503758A/en
Publication of GB503758A publication Critical patent/GB503758A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Electrotherapy Devices (AREA)

Abstract

503,758. Thermionic valve. relay circuits. GENERAL ELECTRIC CO., Ltd., and WESTELL, E. P. L. Oct. 4, 1937, No. 26801. [Class 40 (v)] [Also in Group XXXVIII] A relay 13 is operated by a signal of particular frequency but does not operate if any additional signal of different frequency is present. The relay has two windings energized by the anode current of a cumulative-grid rectifier 10 and by rectified signal currents respectively. The circuit 12 is tuned to signal frequency so that only signal currents are rectified at 14 to energize the associated .winding. The rectifying valve 10 is biassed so that the grid becomes positive and rectification takes place only when signals additional to the correct signals are received. The reduction of anode current consequent upon rectification causes falure of relay 13 tb operate.
GB2680137A 1937-10-04 1937-10-04 Improvements in or relating to electric signalling systems Expired GB503758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2680137A GB503758A (en) 1937-10-04 1937-10-04 Improvements in or relating to electric signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2680137A GB503758A (en) 1937-10-04 1937-10-04 Improvements in or relating to electric signalling systems

Publications (1)

Publication Number Publication Date
GB503758A true GB503758A (en) 1939-04-04

Family

ID=10249441

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2680137A Expired GB503758A (en) 1937-10-04 1937-10-04 Improvements in or relating to electric signalling systems

Country Status (1)

Country Link
GB (1) GB503758A (en)

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