GB312706A - Improvements relating to electric signalling - Google Patents

Improvements relating to electric signalling

Info

Publication number
GB312706A
GB312706A GB703328A GB703328A GB312706A GB 312706 A GB312706 A GB 312706A GB 703328 A GB703328 A GB 703328A GB 703328 A GB703328 A GB 703328A GB 312706 A GB312706 A GB 312706A
Authority
GB
United Kingdom
Prior art keywords
potential
wiper
earth
signal wires
wires
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
GB703328A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB703328A priority Critical patent/GB312706A/en
Publication of GB312706A publication Critical patent/GB312706A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Switches With Compound Operations (AREA)

Abstract

312,706. Siemens Bros. &. Co., Ltd., and Christian, D. A. March 6, 1928. Tell-tale apparatus.-In a system in which ten signals are transmitted over four signal wires a - - d to which potential is applied singly or in combination, the application of potential is effected by a compound wiper-member Q which moves over a row of fixed contacts P to which the signal wires are variably connected. For example, with the arrangement shown, wiper Q in its 3rd position connects earth to terminals 3, 4, 5 and thus to wires b, d, resulting in the operation of relays B, D, and the lighting of lamp 3. The wiper Q may apply more than one potential. For example, the outer prongs may connect up earth, and the centre prong battery, or earth through a high resistance. The system may be used for signalling the position of the contacts of a multi-position switch such as an automatic telephone selector. Specification 279,975 is referred to.
GB703328A 1928-03-06 1928-03-06 Improvements relating to electric signalling Expired GB312706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB703328A GB312706A (en) 1928-03-06 1928-03-06 Improvements relating to electric signalling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB703328A GB312706A (en) 1928-03-06 1928-03-06 Improvements relating to electric signalling

Publications (1)

Publication Number Publication Date
GB312706A true GB312706A (en) 1929-06-06

Family

ID=9825351

Family Applications (1)

Application Number Title Priority Date Filing Date
GB703328A Expired GB312706A (en) 1928-03-06 1928-03-06 Improvements relating to electric signalling

Country Status (1)

Country Link
GB (1) GB312706A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939112A (en) * 1951-02-20 1960-05-31 Gen Telephone Lab Inc Communication circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939112A (en) * 1951-02-20 1960-05-31 Gen Telephone Lab Inc Communication circuit

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