GB494526A - Improvements in or relating to circuits for electromagnetically operated devices foruse in telephone or like systems - Google Patents

Improvements in or relating to circuits for electromagnetically operated devices foruse in telephone or like systems

Info

Publication number
GB494526A
GB494526A GB1204637A GB1204637A GB494526A GB 494526 A GB494526 A GB 494526A GB 1204637 A GB1204637 A GB 1204637A GB 1204637 A GB1204637 A GB 1204637A GB 494526 A GB494526 A GB 494526A
Authority
GB
United Kingdom
Prior art keywords
telephone
systems
foruse
relating
circuits
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
GB1204637A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB1204637A priority Critical patent/GB494526A/en
Publication of GB494526A publication Critical patent/GB494526A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

494,526. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and SAVILLE, W. April 27, 1937, No. 12046. [Class 40 (iv)] A non-linear resistance NLR is connected 'in series with the meter which is connected to battery as shown or to ground and is operated on reply or release or periodically by connecting a booster battery to the holding lead. With the arrangement shown, the voltage of the booster battery can be smaller than that of the main battery, but when the meter is grounded it must be larger. The latter arrangement gives reliable multi-metering. Specification 494,523 is referred to, and the Provisional Specification also refers to Specification 493,375.
GB1204637A 1937-04-27 1937-04-27 Improvements in or relating to circuits for electromagnetically operated devices foruse in telephone or like systems Expired GB494526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1204637A GB494526A (en) 1937-04-27 1937-04-27 Improvements in or relating to circuits for electromagnetically operated devices foruse in telephone or like systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1204637A GB494526A (en) 1937-04-27 1937-04-27 Improvements in or relating to circuits for electromagnetically operated devices foruse in telephone or like systems

Publications (1)

Publication Number Publication Date
GB494526A true GB494526A (en) 1938-10-27

Family

ID=9997450

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1204637A Expired GB494526A (en) 1937-04-27 1937-04-27 Improvements in or relating to circuits for electromagnetically operated devices foruse in telephone or like systems

Country Status (1)

Country Link
GB (1) GB494526A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739641C (en) * 1940-07-17 1943-10-01 Aeg Protective device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739641C (en) * 1940-07-17 1943-10-01 Aeg Protective device

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