Easy Fire Alarm

314

02:15:04

Simple idea but hard to display.  At top, verticals line is small piece of paraffin separating two copper or brass spring strips of metal on each side of paraffin.  Other two single throw switches is the same design with paraffin holding electrical circuit open.
When paraffin melts (125°F. to 165° F.)  copper or brass metal clips complete bell circuit - where lamp is - sounding fire alarm. These switches may be added to existing doorbell circuit if bell stays on when circuit is closed.

published 10 years ago

grummbunger

10 years ago

nice example, i think!

wyoelk

10 years ago

But if both switches close it is a short circuit.

lmccoig

10 years ago

I checked both switches closed when I constructed circuit and it worked fine. Seems after I posted it the two parallel circuits on at same time didn't add up to simulator. Two switches on should work in real world emergency.

hericadani

9 years ago

.l.

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