Alarm Warns Of Fire In Cellar Of Home (Feb, 1939)

Not quite a smoke detector, it has to reach 145 degrees to go off.

Alarm Warns Of Fire In Cellar Of Home
ATTACHED on the ceiling or wall over a furnace, a new automatic fire-alarm device invented by T. E. Campbell, of Wilkinsburg, Pa., provides added protection for the home. If the furnace overheats or a fire breaks out, the alarm rings the doorbell when the temperature reaches 145 degrees, allowing time for investigation before the fire gains headway. The device is small enough to fit in the hand (insert), yet is rugged in construction, its adjustment being unaffected by hard knocks.

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