The Atmos clock is 'The Clock That Runs on Air'.
For centuries scientists had experimented with the idea of perpetual motion and watchmakers and clockmakers yearned for a timekeeping device that would work without the need of manual winding; in short a timepiece that would continue to run under its own power.
By the 1920's the closest they had come to this was the 400 day clock. In the late 1920s, Jean-Leon Reutter, a young Paris engineer produced a clock with a timekeeping mechanism designed specifically to consume the smallest possible amount of power to keep the clock running satisfactorily.
As well as changes to the mechanism, Reutter's clock included a mercury and gas filled bellows that would react to the most sensitive changes in temperature and atmospheric conditions, and in so doing, created a gentle rocking motion that gave power to the clock when needed.
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