Techotic- 1940 Puja Thermo-Pneumatic Clock

1940 Puja Thermo-Pneumatic Clock

Written by: Bruce Cat on: Oct 9 2008 Published in: Gadgets

Ever seen a clock run by thermo-pneumatic tube?

Watchismo has some photos on the Puja 1940 Thermo-Pneumatic Clock. A time keeping master piece.

“At the lower left, shielded by a translucent housing, is a carbon rod resistance that heats the colored alcohol in the glass vessel just above it. This causes some of the alcohol to vaporize, the pressure pushing the liquid up the connecting pipe to the vessel at top right. As the latter gets heavier the wheel bearing the four vessels experiences a torque that rewinds a remontoire spring driving a conventional gear train and escapement. This clock has a pendulum-controlled escapement, but models with balance wheel escapements also existed.”