Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 292
opening and closing the small steam ports, which admit steamto the valve pistons; it is also provided with L shape slots forthe purpose of alternately exhausting steam from the valvepistons through the steam ports. … In operation the main piston rod commences its,forwaidstroke, motion is communicated to the vertical arm, whichmoves forward on the rod until it engages with one of thecams, Ey Fig. 259, adjusted on the valve stem. The arm com-ing in contact with the inclined faces of the cam imparts arollingr or…
Hydraulic machinery · Pumping machinery
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