© Fonds Historique / CNRS Images
Reference
6658
Thermosonus
In 1922, Manuel de Burnay invented the thermosonus, an automatic fire alarm. Mounted on the ceiling, this unit detects sudden thermal wave changes, triggering an alarm. A signal then appears on the panel to which it is connected, thus informing on the location of the fire. (Summary taken from the CNC Patrimoine catalogue)
Duration
00:02:35
Production year
Définition
HD
Color
BW
Sound
Mute
Version(s)
French
Original material
35 mm Film
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