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Old Fire detector (Calling all old gits...)
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<blockquote data-quote="UNG" data-source="post: 499731" data-attributes="member: 8931"><p>As the bi-metallic moved upwards when heated it unlatched the head which dropped and operated the mercury switch which is why they were called drop head detectors</p><p></p><p>Lost count of the number of false alarms they caused because of people using matches or lighters on the bi-metallic strip and then claiming they didn't use matches or a lighter despite the telltale signs on the detector housing</p><p></p><p>As for wanting it on your ceiling there wasn't much choice back then</p></blockquote><p></p>
[QUOTE="UNG, post: 499731, member: 8931"] As the bi-metallic moved upwards when heated it unlatched the head which dropped and operated the mercury switch which is why they were called drop head detectors Lost count of the number of false alarms they caused because of people using matches or lighters on the bi-metallic strip and then claiming they didn't use matches or a lighter despite the telltale signs on the detector housing As for wanting it on your ceiling there wasn't much choice back then [/QUOTE]
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