Machinery and processes of the industrial arts, and apparatus of the exact sciences . will be seen that thereis an opening by which the upperjet B is in communication with theexplosive mixture above the this manner the mixture is , as the effect of the explosionis to exhaust the oxygen in thecylinder, the jet B is necessarilyextinguished. A provision is there-fore necessary to insure its being Fig. before its service is again required. In order to accomplishthis object, a permanent light is placed at A, outside of the cylinder. InFig. 3 the movable jet Bis repres
Machinery and processes of the industrial arts, and apparatus of the exact sciences . will be seen that thereis an opening by which the upperjet B is in communication with theexplosive mixture above the this manner the mixture is , as the effect of the explosionis to exhaust the oxygen in thecylinder, the jet B is necessarilyextinguished. A provision is there-fore necessary to insure its being Fig. before its service is again required. In order to accomplishthis object, a permanent light is placed at A, outside of the cylinder. InFig. 3 the movable jet Bis represented just oppo-site to A, and in this posi-tion it is lighted by com-munication through thefree opening on that Fig. 4 the lower jet isin position to be lighted byanother permanent light,marked A also. When the piston reachesthe end of its course theslide D is drawn upwardso far as to open a freecommunication between Fand the lower chamber ofthe cylinder. A new chargeenters on that side; and this is fired by the lowermovable jet B. Thus theoperation goes on 68 PAEIS UNIVERSAL EXPOSITION. The space K, which is shown in all these figures, is the interval betweenthe cylinder and its jacket, in which cold water is kept 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
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
