GB191302610A - Improvements in or relating to Telephone Systems. - Google Patents

Improvements in or relating to Telephone Systems.

Info

Publication number
GB191302610A
GB191302610A GB191302610DA GB191302610A GB 191302610 A GB191302610 A GB 191302610A GB 191302610D A GB191302610D A GB 191302610DA GB 191302610 A GB191302610 A GB 191302610A
Authority
GB
United Kingdom
Prior art keywords
station
bell
receiver
inductance
relating
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
Inventor
Edward Alfred Graham
William John Rickets
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
Application granted granted Critical
Publication of GB191302610A publication Critical patent/GB191302610A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

2610. Graham, E. A., and Rickets, W. J. Jan. 31. Direct-call systems are arranged so that a call can be made by voice in the telephone instruments or by operating a switch at the transmitting station to bring into circuit a bell at the receiving station. The depression of the switch a at station A connects the bell c at station B and the receiver b at station A in parallel between the supply leads c, f. The interruptions caused by the bell c can be heard in the receiver b. When the key d<1> is depressed, the transmitter h at station A and the receiver b<1> at station B are connected in parallel across the supply leads. In modifications, the inductance g is replaced by a repeating-coil, and the receiver at a calling station and a bell at the called station are adapted to be connected in series with the supply without other inductance in the circuit.
GB191302610D 1913-01-31 1913-01-31 Improvements in or relating to Telephone Systems. Expired GB191302610A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191302610T 1913-01-31

Publications (1)

Publication Number Publication Date
GB191302610A true GB191302610A (en) 1913-07-31

Family

ID=32643792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191302610D Expired GB191302610A (en) 1913-01-31 1913-01-31 Improvements in or relating to Telephone Systems.

Country Status (1)

Country Link
GB (1) GB191302610A (en)

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