The Self-moving Wheel
Take a circle of tin, about ten inches in diameter, or of any other
size that will go into the receiver, and to its circumference fix a
number of tin vanes, each about an inch square. Let this wheel be
placed between two upright pieces on an axis, whose extremities are
quite small, so that the wheel may turn in a vertical position with
the least possible force. Place the wheel and axis in the receiver,
and exhaust the air. Let there be a small pipe with a cock; one end of
the pipe to be outside the top of the receiver, and the other to come
directly over the vanes of the wheel.
When the air is exhausted, turn the cock, and a current will rush
against the vanes of the wheel, and set it in motion, which will
increase, till the receiver is filled with air.
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Feathers Heavier Than Lead
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