Invented in 1928, the Atmos's almost-perpetual movement counts the hours, day after day, year after year, without any need for a battery or winding this is a clock that literally lives on air. Its secret lies in the hermetically sealed capsule positioned at the back of the mechanism which can transform variations in ambient temperature into mechanical energy. Each time the latter rises or falls by a single degree centigrade, the mechanism is able to store up enough energy to guarantee 48 hours of operation. Only the balance's extremely slow oscillating speed and its suspension from a fine Elinvar wire guarantee the mechanism's ability to continue functioning unassisted across the centuries. http://forums.timezone.com/index.php?t=tree&goto=6832988&rid=21#msg_6832988

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