Re: Space towers as a heat engine?

"G=EMC^2 Glazier" <herbertglazier@xxxxxxxxx> wrote in message
news:22582-42740AF3-110@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi Bob Years ago they use to build 350 feet chimneys. The air pressure
> at the ground made a great up force,and if this chimney had blades it
> would turn them with great force. I have a clock that keeps excellent
> time and never needs winding. It runs on air pressure. Bert
>

There is no such thing as a perpetual motion machine. The devices you refer
to use two different principles:

1) Chimneys, regardless of height, cannot run continuously without an
energy source. The pressure differential inside the chimney also exists
outside the chimney, so the net driving force would be zero. Normally, a
heat source produces gas inside the chimney that is less dense than the
surrounding atmosphere. This creates a buoyant force that keeps the chimney
running.

2) The domed clocks that run on air pressure actually run on
*fluctuations* in air pressure. There is a diaphragm between the inside and
the outside of the dome that harnesses enough energy to keep the clock
running. Since the power generated by this pumping action is very small,
the clockwork is also designed to have very little internal friction.

~~~~~~~~~~~
Professor Gauss
~~~~~~~~~~~
To hear is to forget,
To see is to remember,
To do is to understand.
-- Ancient Chinese proverb

Remove caps when replying.
-- me


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