A text-book on chemistry. For the use of schools and colleges (1866)
Draper, Henry, 1837-1882 · New York, Harper & brothers · leaf 259
2-iG THE AIB-PUMP. of the air in the construction of the air-pomp, an instru-ment intended for the removal of air from closed ves-sels. It consists of two cylinders, Fig. 214, the pistons … of which may be alternately raised and depressed by arack and pinion. They communicate by a tube with theinterior of a bell-jar or receiver, which stands on theair-pump plate*and makes a tight joint with it becausethe two are ground flat. On working the handle theair in the bell-jar is, little by…
Chemistry · Physics
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