Machinery and processes of the industrial arts, and apparatus of the exact sciences . ept constantly circu-lating. This is a provision necessary in every gas engine to preventexcessive elevation of temperature. Another expedient which contrib-utes to the same end is the introduction into the interior of the cylinderitself of a small quantity of water along with every charge of gas. Adouble advantage results from this. By its evaporation the water absorbssome heat, and in becoming steam at the same time it prevents the abruptfall of pressure which follows the explosion when the gases are admitt
Machinery and processes of the industrial arts, and apparatus of the exact sciences . ept constantly circu-lating. This is a provision necessary in every gas engine to preventexcessive elevation of temperature. Another expedient which contrib-utes to the same end is the introduction into the interior of the cylinderitself of a small quantity of water along with every charge of gas. Adouble advantage results from this. By its evaporation the water absorbssome heat, and in becoming steam at the same time it prevents the abruptfall of pressure which follows the explosion when the gases are admittedentirely dry. The reality of the advantage is made very apparent bythe curves traced by the index of the manometer, or pressure gauge,when the water is present and when it is absent. In the two figureswhich follow, the first, Fig. 6, shows the violent oscillations, and theabrupt rise and fall of pressure, which are occasioned by the explosionof the gases in the absence of water. The second, Fig. 7, exhibits theevidence of the much better sustained pressure produced by the In both these figures, it will be seen that the curve descends, on theright, for a short distance below the horizontal line. This marks theperiod of admission of the gases to the cylinder when the pressure isnegative. The introduction of water into the cylinder, as here explained, consti-tutes the second peculiarity in which the present engine differs fromthat of Mr. Lenoir. The other differences are of minor importance. engine employs a kind of bellows worked by the engine for theintroduction of the gas into the space where it is mixed with air. and heeffects this mixture before the charge is introduced into the Lenoir draws both the gas and the air directly into the cylinder bythe motion of the working piston itself, and relies for their minglingupon the arrangement of the admission tubes. In the particulars of its construction this engine differs considerablyfrom that last d
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