GB321303A - Improvements in fire alarm systems in conjunction with telephone exchange systems - Google Patents

Improvements in fire alarm systems in conjunction with telephone exchange systems

Info

Publication number
GB321303A
GB321303A GB2987228A GB2987228A GB321303A GB 321303 A GB321303 A GB 321303A GB 2987228 A GB2987228 A GB 2987228A GB 2987228 A GB2987228 A GB 2987228A GB 321303 A GB321303 A GB 321303A
Authority
GB
United Kingdom
Prior art keywords
relay
line
systems
individual
call
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
GB2987228A
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.)
THOMAS MONTACU INMAN
Relay Automatic Telephone Company Ltd
Original Assignee
THOMAS MONTACU INMAN
Relay Automatic Telephone Company 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 THOMAS MONTACU INMAN, Relay Automatic Telephone Company Ltd filed Critical THOMAS MONTACU INMAN
Priority to GB2987228A priority Critical patent/GB321303A/en
Priority to GB2987328A priority patent/GB322050A/en
Publication of GB321303A publication Critical patent/GB321303A/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
    • 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)
  • Telephonic Communication Services (AREA)
  • Alarm Systems (AREA)

Abstract

321,303. Belay Automatic Telephone Co., Ltd., and Inman, T. M. Oct. 16, 1928. Fire, police, and like alarm systems and apparatus.-When a call is made over a telephone exchange system to an emergency circuit, apparatus individual to the calling line, associated with one of the speech conductors and situated at the - exchange, is operated to indicate the line from which the call was made. The circuit of the emergency line is provided with an additional relay FCM, and when an incoming call is received, relay ITT operates, enabling LC and FCM to pull up in series. Relay FCT operates in parallel with RGX and OTM and relays FCMX pull up. Relay FCT connects at FCR battery to the a-wire of the calling line, and this is connected through. contacts of one of the relays FCMX to the indicator FIN individual to the calling line, operating the individual relay FC which locks in series with FA to give an alarm. Specification 303,465 is referred to.
GB2987228A 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems Expired GB321303A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2987228A GB321303A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems
GB2987328A GB322050A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2987228A GB321303A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Publications (1)

Publication Number Publication Date
GB321303A true GB321303A (en) 1929-11-07

Family

ID=10298556

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2987328A Expired GB322050A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems
GB2987228A Expired GB321303A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2987328A Expired GB322050A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Country Status (1)

Country Link
GB (2) GB322050A (en)

Also Published As

Publication number Publication date
GB322050A (en) 1929-11-28

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