n the two tubes, and being regula-ted by the cock, R. Cock, R, governs the air supply. Theorifice, 0, of the air tube terminates just within the interiorof the tube, S. In order to augment the quantity of air in-jected into the gas, four copper pipes, A A, B B, are insert-ed in S, and are so… … expense nearly one half To the orifice, at d, various mouthpieces, some of whichare shown in Figs. 3, 7, and 8, may be attached. Each piececonsists of a ring, which either slips over or inside of d, andthis ring is joined to the main tube, N, Fig. 3, by two thinpieces of metal, e. The openings on…
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