GB191307288A - Improvements in Automatic Fire Alarm Systems. - Google Patents
Improvements in Automatic Fire Alarm Systems.Info
- Publication number
- GB191307288A GB191307288A GB191307288DA GB191307288A GB 191307288 A GB191307288 A GB 191307288A GB 191307288D A GB191307288D A GB 191307288DA GB 191307288 A GB191307288 A GB 191307288A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- devices
- temperature
- magnet
- electro
- 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
Landscapes
- Fire-Detection Mechanisms (AREA)
Abstract
7288. Garretson, E. March 27. Alarms, fire; electric alarm systems.-In an automatic electric fire-alarm system, the thermal operating-devices consist of conducting-bodies formed of a material, such as silver sulphide or a composition containing it, having a high resistance and a negative resistance-temperature coefficient, a dangerous rise of temperature reducing the resistance sufficiently to effect the operation of the alarm mechanism. A closed circuit 19, 20 contains a resistance 14 and a high-resistance electro-magnet 16, which energizes a swinging soft-iron shutter 17 normally adhering to a soft-iron fan-wheel 18 forming part of an electro-mechanical gong 15. The thermally-sensitive resistance devices 11 are connected in multiple, so that on a dangerous rise of temperature, the magnet 16 is partially shortcircuited, and the gong 15 released. The operating-temperature of the devices 11 may be regulated by varying the electromotive force of the battery, and the system may be tested by increasing the electromotive force and consequently the electric heating of the devices 11.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB191307288T | 1913-03-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB191307288A true GB191307288A (en) | 1913-07-10 |
Family
ID=34359322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB191307288D Expired GB191307288A (en) | 1913-03-27 | 1913-03-27 | Improvements in Automatic Fire Alarm Systems. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB191307288A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2456617A (en) * | 1943-07-30 | 1948-12-21 | Lyndon W Burch | Liquid level indicator |
-
1913
- 1913-03-27 GB GB191307288D patent/GB191307288A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2456617A (en) * | 1943-07-30 | 1948-12-21 | Lyndon W Burch | Liquid level indicator |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US880272A (en) | Thermo-electrical system. | |
GB191307288A (en) | Improvements in Automatic Fire Alarm Systems. | |
US3176284A (en) | System responsive to plural conditions with false indication prevention | |
US3284787A (en) | Multi-purpose alarm system | |
US989420A (en) | Fire-alarm. | |
US513829A (en) | Electric alarm | |
GB779282A (en) | Self-resetting electrical network automatically responsive to a condition | |
US1066731A (en) | Thermostatic alarm. | |
US1003009A (en) | Fire-alarm. | |
US1111708A (en) | Automatic fire-alarm system. | |
US754555A (en) | Automatic fire-alarm. | |
US471929A (en) | Automatic electric fire-alarm | |
US1819834A (en) | Thermostatic switch control mechanism | |
US487519A (en) | Thermostat | |
US1025713A (en) | Call-box. | |
US910118A (en) | Fire-alarm signaling device. | |
US1530419A (en) | Electric alarm apparatus | |
US1344471A (en) | Automatic fire-alarm | |
US761198A (en) | Heat-actuated alarm system. | |
US972840A (en) | Fire-alarm. | |
US655411A (en) | Electrical detector for heat or cold. | |
US962552A (en) | Fire-alarm. | |
GB191416595A (en) | Improvements in Electric Alarms. | |
US727315A (en) | Thermal electric fire-alarm. | |
US302485A (en) | Electrical safety |