Atmos clock, Jaeger LeCoultre, Switzerland, 1953.

This clock is perpetually self-winding, powered by changes in atmospheric temperature. A mixture of gas and ethyl chloride in a sealed container expands and contracts with changes in temperature, thereby compressing and releasing a spiral spring that in turn winds the mainspring. A change of one degree will wind the clock for two days. A torsion pendulum completes only two oscillations per minute.

Physical Description

See also Trade Literature. Contents from List of Parts Field: Trade Literature.

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