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Mechanical fire alarm


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Sorry there is no picture, but I found a mechanical fire alarm on a kitchen ceiling I have never seen the likes of.

When I pushed what looked like a test button the "button" fell off and a loud alarm bell sounded.  The buyer, the realtor and I assumed it was hardwired, but throwing even the main breaker would not make it shut up.  After wrestling it from its mount on the ceiling we discovered that it was not battery powered but was a wind-up machine that only got quiet when the wound device ran down.  I did not have the tiny hex key it took for winding.  Our study of the labeling found it only responded to heat and was not a smoky at all.

Anyone here encountered these?  It was round, about ten inches in diameter, and loud as hell.

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