GB112897A - Improvements relating to the Electric Transmission of Signals. - Google Patents

Improvements relating to the Electric Transmission of Signals.

Info

Publication number
GB112897A
GB112897A GB989817A GB989817A GB112897A GB 112897 A GB112897 A GB 112897A GB 989817 A GB989817 A GB 989817A GB 989817 A GB989817 A GB 989817A GB 112897 A GB112897 A GB 112897A
Authority
GB
United Kingdom
Prior art keywords
signals
electric transmission
improvements relating
circuit
potential
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
GB989817A
Inventor
Ernest Alexander Laidlaw
William Herbert Grinsted
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB112897A publication Critical patent/GB112897A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Selective Calling Equipment (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

112,897. Laidlaw, E. A., and Grinsted, W. H. July 9, 1917. Addition to 112,985. Repeaters, non-circuit-closing.-In a signalling system of the kind described in the parent Specification a tuned oscillating circuit c<1>, k is closely coupled to a relay in the form of a three-electrode vacuum device, the grid circuit of which contains the secondary winding c<2> of the coupling transformer c', c<2> and a battery b<3>, the potential of which is of such a value that the potential of the grid is always negative to that of the filament.
GB989817A 1917-02-01 1917-07-09 Improvements relating to the Electric Transmission of Signals. Expired GB112897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB165317A GB112985A (en) 1917-02-01 1917-02-01 Improvements relating to the Electric Transmission of Signals.

Publications (1)

Publication Number Publication Date
GB112897A true GB112897A (en) 1918-01-31

Family

ID=32243360

Family Applications (2)

Application Number Title Priority Date Filing Date
GB165317A Expired GB112985A (en) 1917-02-01 1917-02-01 Improvements relating to the Electric Transmission of Signals.
GB989817A Expired GB112897A (en) 1917-02-01 1917-07-09 Improvements relating to the Electric Transmission of Signals.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB165317A Expired GB112985A (en) 1917-02-01 1917-02-01 Improvements relating to the Electric Transmission of Signals.

Country Status (1)

Country Link
GB (2) GB112985A (en)

Also Published As

Publication number Publication date
GB112985A (en) 1918-02-01

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