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 243
—Are not air pumpvalves now very generallymade of india rubber ? A.—They are almost in-variably so made if the en-gines are travelling fast, asin the case of direct actingscrew engines, and they arevery often made of large discs or rings of india rubber, evenwhen the engines travel slowly. A very… … Trunk Air Pump. Scaled inch to 1 foot. DISO VALVES FOPw AIR PUMPS. 229 Fi^. 42.
Steam engineering · Steam-engines
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