Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 388
e balanced valves by slower move-ments of the piston ; but present practiceis to obtain outlets by increasing the num-ber of valves, the total area of the aper-tures, and the speed. Fig. 849 is a single-beat direct lift-valve guided by three feathers on its under side, which slide in the… … \r . . .. ^ Nj I- ■ ■ . ■ 1 ^ u 1 N £
Mechanical drawing
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