little grease.A pipe communicates with the receiver by means of anorifice B in the metal plate, and with two cylindricalbarrels by valves C and D opening upwards. In thesebarrels air-tight pistons E and F, furnished with valvesopening upwards, are worked up and down by the rack-wheel W, which is… … be at the bottom; and then the wheel being turned in theopposite direction, F will ascend and E descend. Nowit will be seen that all the valves open upwards, and thatwhen the valve at the bottom of the cylinder is opeUj thevalve in the piston which works in that cylinder is shut,and vice vend. Thus…
Hydrostatics
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