Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 99
thetray, regulate or suspend the reaction between the zinc and its solvent, accordingly as the supply ofhydrogen is to be produced, suspended, increased, or diminished. The communication with the reservoir is « pened and regulated by means of the cock P, furnishedwith a gallows-screw G for the… … similar vessels of boiler-iron, each capable of holding forty gallons. They are lined internally withcopper, being situated upon a wooden frame, so that the bottom of one is two-thirds as high as the topof the other. The upper portion of these vessels communicate by a leaden pipe B, of about half…
Mechanical engineering
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