The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 43
shows, by means ofan indtx-|jlato H, tlie position of the valve. On the opposite side ofthe tank I would |ilaee another valve 1, the spindle of which would beatlacliLd to the rod of a small piston working in a cylinder J, open atbottom, and of equal area to the valve I, the top side of which is… … The action of this apparatus may be explained in the followingmanner:—Supposing the boiler at work with a pressure of 4Ulb. onthe square inch, I propose that the weight L should exert a pres-sureof l^lb. on each square inch of the valve I, which would be (sup-posing the valve to be 2iin. diameter)…
Architecture · Civil engineering · Science
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