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Scientific American, Vol. 39, No. 10 (1878) (1878)
leaf 10
is provided with a platinum British Muscum, South Kensington Muscum, etc., should sponding deflection of the balance renders this plainly visi- pointed screw which passes through the lever at right angles be better known among all classes of the people there than ble. When the current is reversed,… … © 1878 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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