Fire Alarm Talks Over Telephone (May, 1935)

Fire Alarm Talks Over Telephone
A PERFECT fire alarm, when heated, lifts a telephone receiver, dials the operator, informs her as to the exact location of the fire, and rings a guiding alarm.
The device is ingeniously controlled by a thermostat. When heated to the danger point, the thermostat sets the machinery in motion. A screw plate rises to lift the receiver, a metal finger dials the operator, and the phonograph starts repeating the directions, which, together with the loud gong, bring the firefighters directly to the scene.