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 244
is that represented infigs. 42, 43, and 44; figs. 42and 43 being a section andground plan of the species ofvalve used by Messrs. Penn,and ^g. 44 being a section ofthat used by Messrs. Maudslay.It is important in these valvesto have the india rubber thick,—say about an inch thick forvalves eight… … PE^^N■s Disc Valvf, for Air Pump.Ground Plan.
Steam engineering · Steam-engines
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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