This is a 50 years (approximate) old photo of
a clock. The description of the photo says,
it runs by the air; Winding , batteries
or electricity are not necessary for this clock.
It works using the temperature change and the
barometric pressure.
It's name is Atmos.I have never seen a clock
like this and don't know about this type
of clocks.
Have anyone seen a clock like this?
Wikipedia Link
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