Jaeger-LeCoultre Atmos
A table clock powered by small changes in temperature that runs almost without winding.
The engineer Jean-Léon Reutter invented the principle in 1928, and Jaeger-LeCoultre began making the clock in 1936. A difference of one degree in temperature is enough to run it for two days. Switzerland has given the Atmos as a state gift.
Materials: Brass, glass; movement with a gas-filled bellows
Manufacture: Made in Le Sentier; a bellows filled with gas expands and contracts as the temperature changes.
The visible movement behind glass.
The slow torsion pendulum that turns back and forth.