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Scientific American, Vol. 49, No. 11 (1883) (1883)
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n whose verification might y the use of this separately driven condenser a vacuum be asked for either by governments or scientific societies, or be obtained before the pump is started, and the speed of air pump can be varied according to the temperature. even by artists and scientists. An… … © 1883 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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