The Eco Friendly Clock From The Past

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

The Inside of a Clock

These are inside views of a table clock.This clock
is more than 45 years old and it is still in working
condition.It was easier for me to open the cover of
the clock, by unscrewing the 8 screws.It has double
cover in the back. But it was difficult to reassemble
the parts. It's weight - 600 g