finned-head fire detector

finned-head fire detector
A nonresetting fire detector. It is made up of molded insulating material housing a pair of silver-radium electrical contacts. A fusible joint holds the contacts apart. With the rise in temperature beyond 200 to 210°C, the joint fuses and the electrical circuit is closed, illuminating the warning lamp. Modern-day fire detectors are the resetting type.

Aviation dictionary. 2014.

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