Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 125
the centre of gravity of the attached weight beyond its supportingpoint, which allows the globe to fall and open the steam-valve. The steam-pressure closes the check-valve in the supply-pipe, and allows the water in the trap toflow into the boiler through the bottompipe, whose check-valve opens to… … operation of its attendant mechanism. The water of condensation is again admitted by the openingof the check-valve in the supply-pipe, and the operation is repeated continuously. The steam-valveapparatus is so nicely adjusted that the machine cannot by any possibility rest on a centre; the valve…
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