Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 287
r end with the exhaust port.The steam, acting on the valve pistons, moves both, openingthe main ports, F and F,, admitting steam to one end of the steam cylinder and open-ing the other end to theexhaust. If the valve oc-cupies any other positionthan the one described, themain ports, F and F,,… … Fig. 249.
Hydraulic machinery · Pumping machinery
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