The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 369
nnearly half full of water, intowhich pour about one-fifteenth itsbulk of sulphuric acid, and mixwell; lower the bell with its zincinto the liquid, and secure the cover by the binding-screws;open the stop-cock, and allow the liquid to rise in the bell, andthen close it again. The action of the… … * A leather-washer should be placed on the cap of this bell, between thisand the wood, to avoid the possibility of a leakage. t The rationale of this is as follows : The water is decomposed ; its oxygenuniting with the zinc forms an oxide of zinc, while the hydrogen, the otherelement of the water,…
Physics
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