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Scientific American, Vol. 52, No. 20 (1885) (1885)
leaf 4
powerful air pump. We thus obtain a high vacuuin, has been patented by Mr. Emil Baumbach, of 241 which reduces the boiling point and enables the con- centration to be carried on at a very low temperature. The apparatus is so constructed that the pans may be et 0 worked as single vacuum pan or as a… … APPARATUS, © 1885 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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