Electrically Operated Fire Alarm Systems
Electrically operated fire alarm systems came into vogue first through the development of the thermostat, a device which responds to the presence of heat by causing a bi-metalic element to deflect and make an electrical contact so that current may flow through an alarm circuit.

This was followed by the photoelectric cell, the electrical resistance of which changes according to the amount of light falling on the surface. When light from a companion source placed at some distance from the receiving cell is interrupted by the presence of smoke, a change in the electrical output of the cell is used to activate a relay.

In the world of today, automatic fire detection and alarm indicating systems are much more sophisticated, involving complex electronic circuitry, computerised control systems and radioactive smoke detection devices. In addition to the bi-metallic strip heat detectors and heat sensitive line detectors, thin cables which, respond to the presence of heat over any part of their length by electrical resistance changes which, in turn; cause alarm circuits to activate.

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