Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 508
ent itsoverflow. At this moment the three-way cock is again turned so as toclose the lateral opening, and the movable reservoir is transferred to thelower bracket. On opening now the upper stop-cock, the air in the vesselto be exhausted will be rarified by the descent of the mercurial column,and a… … 492 PAEIS UNIVERSAL EXPOSITION. is employed only in the exhaustion of small vessels or tubes for labora-tory purposes, or for the preparation of electrical apparatus. A larger form of the same contrivance is employed by the Messrs.Alvergniat, in which the tube of caoutchouc is dispensed with, and…
Machinery · Scientific apparatus and instruments
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