GB191326287A - Improvements in and relating to Telephone Systems. - Google Patents

Improvements in and relating to Telephone Systems.

Info

Publication number
GB191326287A
GB191326287A GB191326287DA GB191326287A GB 191326287 A GB191326287 A GB 191326287A GB 191326287D A GB191326287D A GB 191326287DA GB 191326287 A GB191326287 A GB 191326287A
Authority
GB
United Kingdom
Prior art keywords
station
inductances
current
inductance
mains
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
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 GB191326287A publication Critical patent/GB191326287A/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)
  • Near-Field Transmission Systems (AREA)

Abstract

26,287. Graham, E. A. Nov. 15. Direct-call systems.-In systems in which current is supplied from mains K, M, the transmitting- instruments at one station are supplied with current through an inductance B or B' at the other station. When the key G at a station X is on the calling contact I, current from the main M passes through the inductance B<1> at a station Y over a line L and vibrator F to the main K. The interruptions in this circuit are reproduced in the parallel circuit through the condenser C' and receiver D<1>. An inductance A may be inserted in the positive supply main. The inductances B, B' may be used to operate call signals, such as flags, lamps, or bells, or may be used to operate a contact to bring into circuit the transmitter at the called station. Part of the inductances may be used as energizing-coils for the telephone receivers. The current for each transmitter may be fed through both inductances in parallel, and the inductances may be replaced by repeating-coils. Two or more pairs of stations may be connected on the same pair of mains. Batteries at each station may be used in place of the supply mains.
GB191326287D 1913-11-15 1913-11-15 Improvements in and relating to Telephone Systems. Expired GB191326287A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191326287T 1913-11-15

Publications (1)

Publication Number Publication Date
GB191326287A true GB191326287A (en) 1914-04-23

Family

ID=32580763

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191326287D Expired GB191326287A (en) 1913-11-15 1913-11-15 Improvements in and relating to Telephone Systems.

Country Status (2)

Country Link
FR (1) FR470383A (en)
GB (1) GB191326287A (en)

Also Published As

Publication number Publication date
FR470383A (en) 1914-09-08

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