The steam engine familiarly explained and illustrated; with an historical sketch of its invention and progressive improvement; its applications to navigation and railways; with plain axioms for railway speculators (1849)
Pl.X. Fiff. -J-ff. … £>wr. lyJRJKaveridk DOTTBLE-CXXINDER ENGINES. 143 above the surface of the liquid in h forces it through i intothe boiler. When the air accumulates in too great a degreein h, the surface of the liquid is pressed so low that the ballfalls and opens the valve, and allows it to escape. The airin h…
Steam-engines
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