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GB2019163A - Improvements in methods for monitoring electrically conductive circuits for discontinuities - Google Patents

Improvements in methods for monitoring electrically conductive circuits for discontinuities

Info

Publication number
GB2019163A
GB2019163A GB7902759A GB7902759A GB2019163A GB 2019163 A GB2019163 A GB 2019163A GB 7902759 A GB7902759 A GB 7902759A GB 7902759 A GB7902759 A GB 7902759A GB 2019163 A GB2019163 A GB 2019163A
Authority
GB
United Kingdom
Prior art keywords
circuit
electrically conductive
discontinuities
methods
conductive 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.)
Withdrawn
Application number
GB7902759A
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.)
Smalley A J
Original Assignee
Smalley A J
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 Smalley A J filed Critical Smalley A J
Priority to GB7902759A priority Critical patent/GB2019163A/en
Publication of GB2019163A publication Critical patent/GB2019163A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)

Abstract

The invention relates to a method of monitoring an electrically conductive circuit 20, for a discontinuity therein, such as a circuit consisting of electrically conducting wire linking a series of switches 8-11 located at each external door 8 or window 5-7 in an unoccupied building. The circuit is linked in parallel to a telephone receiver 2 and includes an audible indicator unit 1 such that when a call is made to the receiver from an external source the telephone will emit one form of signal, which may be a recorded message, when the circuit is continuous and a different form of signal, which may also be a recorded message, when the circuit has a discontinuity, e.g. a door or window has been opened. <IMAGE>
GB7902759A 1977-11-08 1979-01-25 Improvements in methods for monitoring electrically conductive circuits for discontinuities Withdrawn GB2019163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7902759A GB2019163A (en) 1977-11-08 1979-01-25 Improvements in methods for monitoring electrically conductive circuits for discontinuities

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4631977 1977-11-08
GB7902759A GB2019163A (en) 1977-11-08 1979-01-25 Improvements in methods for monitoring electrically conductive circuits for discontinuities

Publications (1)

Publication Number Publication Date
GB2019163A true GB2019163A (en) 1979-10-24

Family

ID=26265790

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7902759A Withdrawn GB2019163A (en) 1977-11-08 1979-01-25 Improvements in methods for monitoring electrically conductive circuits for discontinuities

Country Status (1)

Country Link
GB (1) GB2019163A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144303A (en) * 1983-07-22 1985-02-27 Remote Interrogations Pty Ltd Interrogation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144303A (en) * 1983-07-22 1985-02-27 Remote Interrogations Pty Ltd Interrogation device

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)