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Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries (1914)

Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley Publishing · leaf 45

An illustration from Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries, 1914, leaf 45
mpanied by a movement of the pointer,Z, which plays over a double scale. The centralpoint of the arm, Z, indicates on the lower scale(graduated from o to 100) the relative moisture.Hygrometers which are employed at no great eleva-tions are influenced by the moisture of the soil after a heavy fall…

Mechanical movements

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