Greenhill, G. (George), Sir, 1847-1927 · London and New York, Macmillan and Co. · leaf 23
g^^w..//....v..//w/^/////////^/p<^ Fig. I. Sometimes the valve is held down by a weight (fig. 2)or by a spiral spring, superposed directly without theintervention of a lever as in fig. 3, the form used insteamers and hydraulic machinery. The danger of the sticking of the valve in the seat…
Hydrostatics
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