Autonomous clock, that charges through temperature fluctuations


Jaeger Lecoultre reissues the Atmos clock, that charges autonomously through temperature fluctuations. The energy consumption of a 15-watt electric light bulb is equivalent to the needs of sixty million near-perpetual clocks.


It was in 1928 that the Neuchâtel engineer Jean-Léon Reutter patented his design for a mechanism that ran on variations in pressure. Each time the latter rises or falls by a single degree centigrade, the mechanism is able to store up enough energy to guarantee two days of function. A hermetically sealed gas-filled capsule expands when the temperature rises and contracts when it drops, that winds the clock’s mainspring: the perpetual motion has been achieved.

Besides the technical feat which requires an extreme accuracy, the brand has redesigned the clock, to bring it up to date. 

Photos © Jaeger Lecoultre

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Wednesday 4 January 2023, 11:00