GB461319A - Improvements in or relating to electric signalling apparatus - Google Patents

Improvements in or relating to electric signalling apparatus

Info

Publication number
GB461319A
GB461319A GB2262335A GB2262335A GB461319A GB 461319 A GB461319 A GB 461319A GB 2262335 A GB2262335 A GB 2262335A GB 2262335 A GB2262335 A GB 2262335A GB 461319 A GB461319 A GB 461319A
Authority
GB
United Kingdom
Prior art keywords
relay
signals
calling station
circuit
fire
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
GB2262335A
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
Priority to GB2262335A priority Critical patent/GB461319A/en
Publication of GB461319A publication Critical patent/GB461319A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M11/045—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems using recorded signals, e.g. speech

Landscapes

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

Abstract

461,319. Fire, police, and like alarm systems. SHIPTON, E. Aug. 10, 1935, No. 22623. [Class 40 (i)] The receiving-apparatus of a fire-alarm system is arranged to record an indication of the calling station, to announce a received message, and to record the date and/or time of its receipt. The apparatus is arranged to be selected over an automatic telephone system and the indication of the calling station is transmitted by voice frequency pulses. Suitable sub-station apparatus for use with the unit is described in Specification 394,021. When ring- ing current is received over line 1, 1, relay A energizes and relay B pulls up. The date and/or time stamp DS is operated and is then cut out of circuit and the ringing is tripped. Resistance Rl in the valve heater circuit is shorted to enable the valves to function. The message from the calling station is amplified by valves V1, V2 and is announced by loud-speaker LS. The signals for operating the recording apparatus are of the frequency to which T1 is tuned so that these signals are fed to valve V3 and upset the balance of the bridge R3, R4, R5, V3. Relay C repeats the signals to the recorder M1. When the signal is finished, the transmitter sends a long note which allows slow relay D to energize. The locking circuit of relay A is opened and the apparatus restores to normal. Specification 18262/12, [Class 40 (iv)], also is referred to.
GB2262335A 1935-08-10 1935-08-10 Improvements in or relating to electric signalling apparatus Expired GB461319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2262335A GB461319A (en) 1935-08-10 1935-08-10 Improvements in or relating to electric signalling apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2262335A GB461319A (en) 1935-08-10 1935-08-10 Improvements in or relating to electric signalling apparatus

Publications (1)

Publication Number Publication Date
GB461319A true GB461319A (en) 1937-02-10

Family

ID=10182425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2262335A Expired GB461319A (en) 1935-08-10 1935-08-10 Improvements in or relating to electric signalling apparatus

Country Status (1)

Country Link
GB (1) GB461319A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG119162A1 (en) * 1998-06-15 2006-02-28 Nohmi Bosai Ltd Fire alarm system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG119162A1 (en) * 1998-06-15 2006-02-28 Nohmi Bosai Ltd Fire alarm system

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