A history of the growth of the steam-engine (1878)
Thurston, Robert Henry, 1839-1903 · New York, D. Appleton · leaf 299
his proved thoroughly satisfactory, and the hog-frame,as it has since been inelegantly but universally called, isstill one of the peculiar features of every American river-steamer of any considerable size. It was in the NorthAmerica, also, that he first introduced the artificial blastfor forcing… … STEAM-NAVIGATION. 275 New Philadelphia in 1828, and fitted the steam-cylinderwith the double-poppet valve, which is now universally-used on beam-engines. This consists of two disk-valves,connected by the valve-spindle. The disks are of unequalsizes, the smaller passing through the seat of the…
Steam-engines
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