apin, for the Elector ofHesse, in 1707. It differs in having a piston, working in thevessel into which the steam is alternately admitted and con-densed, and makes no important use of the pressure of the at-mosphere. It appears that, even with the aid of the celebratedLeibnitz, he had been unable to… … a is the boiler, furnished with a safety valve b, pressed downby a weight c, suspended from a lever. Water is introducedinto the boiler through this valve, fis the forcing vessel, hav-ing an aperture at the top closed by the valve g. A piston isplaced in this vessel, having a socket into which a…
Steam-engines
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