A history of the growth of the steam-engine . itted with a cock to act asa steam-valve. A pipe led also from the top of the cylin-der to the condenser, the syringe being inverted and thepiston-rod hanging downward for convenience. The con-denser was made of two pipes of thin tin plate, 10 or 12inches long, and about one-sixth of an inch in diameter,standing vertically, and having a connection at the-top Lives of Boulton and Watt, Smiles. JAMES WATT AND HIS INVENTIONS. 89 with a horizontal pipe of larger size, and fitted with a snifting-valve. Another vertical pipe, about an inch indiameter, wa
A history of the growth of the steam-engine . itted with a cock to act asa steam-valve. A pipe led also from the top of the cylin-der to the condenser, the syringe being inverted and thepiston-rod hanging downward for convenience. The con-denser was made of two pipes of thin tin plate, 10 or 12inches long, and about one-sixth of an inch in diameter,standing vertically, and having a connection at the-top Lives of Boulton and Watt, Smiles. JAMES WATT AND HIS INVENTIONS. 89 with a horizontal pipe of larger size, and fitted with a snifting-valve. Another vertical pipe, about an inch indiameter, was connected to the condenser, and was fittedwith a piston, with a view to using it as an whole was set in a cistern of cold water. The piston-rod of the little steam-cylinder was drilled from end to endto permit the water to he removed from the cylinder. Thislittle model (Fig. 25) worked very satisfactorily, and theperfection of the vacuum was such that the machine lifteda weight of 18 pounds hiyig upon the piston-rod, as in the. Fig. 25.—Watts Experiment sketch. A larger model was immediately afterward con-structed, and the result of its test confirmed fully the antici-pations which had been awakened by the first experiment. Having taken this first step and made such a radicalimpi-ovement, the success of this invention was no soonerdetermined than others followed in rapid succession, as con-sequences of the exigencies arising from the first change inthe old Newcomen engine. But in the working out of theforms and proportions of the details of the new engine,even Watts powerful mind, stored as it was with happily-combined scientific and practical information, was occupied 90 THE DEVELOPMENT OP THE MODERN STEAM-ENGINE. for years. In attaching the separate condenser, he firstattempted surface-condensation ; hut this not succeedingwell, he substituted the jet. Some provision became atonce necessary for preventing the filling of the condenserwith water. Watt at first
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
