A catechism of the steam engine in its various applications to mines, mills, steam navigation, railways, and agriculture. With practical instructions for the manufacture and management of engines of every class (1864)
Bourne, John · New York, D. Appleton & co. · leaf 246
figs. 42. 43, and 44: figs. 42and 43 being a section andground plan of the species ofvalve used by Messrs. Penn.and fig. 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 inches in diam-eter. It… … w#a Pe>-:ss Disc ^ alvf. foe A is PrinGround Plan.
Steam engineering · Steam-engines
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