A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 191
condensing syringes and air-pumps, as being much less expensive than stop-cocks, and moreeasily kept in proper order. 27. The air-pump, as mightbe inferred from its appella-tion, is a machine for ex-tracting air out of a closevessel, and thus producingwrithin it a degree of rare-faction nearly… … will not at all interfere with the results of our experiments. 28. The figure in the margin exhibits a section of an air-pump, from which it may be perceived that it essentially consistsof two exhausting syringes, so arranged that they can be workedalternately. The syringes are marked A A, and…
Physics
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