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
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.
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) |
-
1913
- 1913-11-15 GB GB191326287D patent/GB191326287A/en not_active Expired
-
1914
- 1914-04-01 FR FR470383A patent/FR470383A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR470383A (en) | 1914-09-08 |
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