Farm Machinery and Farm Motors

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Orange Judd, 1908 - 513 páginas
 

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has a chapter on windmills

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Página 424 - The horse power of a steam engine is given by the equation , plan = ~ where p = mean effective pressure in pounds per square inch, l = length of stroke in feet, a = area of piston in square inches, n = number of strokes per minute, or twice the number of revolutions per minute.
Página 364 - We know that a certain amount of heat is required to change one pound of water at a given temperature into steam at the same temperature ; this is called the latent heat, or heat of vaporization.
Página 485 - Comparison with a dynamo. — A dynamo is a machine for converting mechanical energy into electrical.

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