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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