. American engineer and railroad journal . any great pressure, and were kept freefrom oil, left little to be desired in their working, even to thepresent time holding their own in circulating and such likepumps. Oil having a solvent action on the rubber, they werefound to rapidly deteriorate in the air pumps. Attempts hadbeen made to make the rubber impervious to oil, but up to thepresent unsuccessfully. Vulcanite, a hardened preparation ofrubber, fiber, asbestos, cast-metal valves of various types, andthin rolled phosphor bronze sheets followed, the tendencybeing as the piston speeds and pres
. American engineer and railroad journal . any great pressure, and were kept freefrom oil, left little to be desired in their working, even to thepresent time holding their own in circulating and such likepumps. Oil having a solvent action on the rubber, they werefound to rapidly deteriorate in the air pumps. Attempts hadbeen made to make the rubber impervious to oil, but up to thepresent unsuccessfully. Vulcanite, a hardened preparation ofrubber, fiber, asbestos, cast-metal valves of various types, andthin rolled phosphor bronze sheets followed, the tendencybeing as the piston speeds and pressures kept on increasing forthe valves to be lighter and of stronger section. The authorthen proceeded to refer in detail to the special features of thebest-known valves now in use, and, in conclusion, said hehoped that members would contribute particulars of any fur-ther valves which might not have been mentioned, so that theinformation furnished as to available pump valves mightfairly cover the ground as represented by modern Fig. 1.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
