A catechism of the steam engine and its various applications to mines, mills, steam navigation, railways, and agriculture (1876)
Bourne, John, civil engineer. [from old catalog] · New York, D. Appleton and company · leaf 106
ethree ported valve, shown in ^g. 33, which con-sists of a brass or iron box set over the two portsor openings into the cylinder, and a central portwhich conducts away the steam to the atmosphereor condenser; but the length of the box is so ad-justed that it can only cover one of the cylinderports… … 92 EXPLANATIOX OF THE NATUEE OF LEAD. and the central passage whereby the steam escapes ; and whilethe steam is escaping from beneath the piston, the position ofthe valve is such, that a free communication exists between thespace above the piston and the steam in the boiler. The pistonis thus urged…
Steam engineering · Steam-engines
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