. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. he earing bracket for the shaft cast alongwith it. The space above the piston communicates freely with the air by the rectangular opening,Fig. 1224. The bottom of the cylinder has a single port communicating with the chamber of aplain piston valve, which when raised opens communication with the exhaust, and when down,as in Fig. 1225, connects the cylinder with the gas and air inlet openings. This valve is workedby an ordinary eccentric through the intervention of a rocking lever. The eccentric is placedabo
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. he earing bracket for the shaft cast alongwith it. The space above the piston communicates freely with the air by the rectangular opening,Fig. 1224. The bottom of the cylinder has a single port communicating with the chamber of aplain piston valve, which when raised opens communication with the exhaust, and when down,as in Fig. 1225, connects the cylinder with the gas and air inlet openings. This valve is workedby an ordinary eccentric through the intervention of a rocking lever. The eccentric is placedabout 135° in advance of the crank. At a third of the stroke up the cylinder there is a little openingon one side of the latter, opposite which, outside, is the nozzle of a small gas pipe; and directlybelow this nozzle is an ordinary burner, connected with the same pipe, the gas at which is keptalways lighted. Fig. 1224. The two gas burners are protected from draughts by enclosure in a boxcasing. The upper burner is the real ignition jet, the function of the lower one, which is burning. 600 ENGINES. continuously, is to religlit the other when it is blown out. The crank shaft lies across the machinea considerable distance from its axis, the apparent irregularity of action of this arrangement being -ingeniously taken advantage of. The piston being at the bottom of its stroke, is at first raised by the energy stored in the fly-wheel and counterweight, and draws into the cylinder the mixture of air and gas through thevalve. As soon as the bottom of the piston rises above the opening in the cylinder side, the jetoutside explodes the mixture, and the explosion drives the piston to the top of its stroke. Thepressure under the piston falls below that of the atmosphere, so that in its descending course thepiston is at first driven downwards by the atmospheric pressure. The position of the connectingrod is so adjusted that it acts direct on the crank when the explosion drives the piston up
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
