GB461319A - Improvements in or relating to electric signalling apparatus - Google Patents
Improvements in or relating to electric signalling apparatusInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SG119162A1 (en) * | 1998-06-15 | 2006-02-28 | Nohmi Bosai Ltd | Fire alarm system |
-
1935
- 1935-08-10 GB GB2262335A patent/GB461319A/en not_active Expired
Cited By (1)
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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