Electrochemical and metallurgical industry . sed power with the same fuel obtained fromthe Sargent complete expansion engine. The point of cut-off,while constant for the full and most economical load of theengine, is made earlier by the governor as the load gets lighteror later as the load gets heavier, giving a flexibility unobtain-able in the ordinary internal combustion engine. No throttling action of the incoming charge, with its cor-responding loss of efficiency, so apparent in the ordinary gasengine, is possible, and owing to the more complete expansion I Kt K Al. WD Ml r.
Electrochemical and metallurgical industry . sed power with the same fuel obtained fromthe Sargent complete expansion engine. The point of cut-off,while constant for the full and most economical load of theengine, is made earlier by the governor as the load gets lighteror later as the load gets heavier, giving a flexibility unobtain-able in the ordinary internal combustion engine. No throttling action of the incoming charge, with its cor-responding loss of efficiency, so apparent in the ordinary gasengine, is possible, and owing to the more complete expansion I Kt K Al. WD Ml r.\;\L INDUSTRY. [Vol. 111. No. 9. 1)1 the l)iiriiinR gases tiiniinR tlu- lu-at into work instead oftlirowinK it away in tlie cxliaust, a lower terminal temperatnre,and. conse(|nently. a lower average temperature of the cylin-ders is maintained thron);luint tlie eycKv Ior this reasonengines of tliis type hei^w 100 hp. recpiire no water-co(jle-I inetiv el> the cam pnsiies the roller down and the piston np, which opensthe poppet, and the exhaust gases pass out through ports Kand the elhow W to the exhaust pipe under the floor. The poiipet valve seals the opening in the combustion cham-ber (luring compression and inllaniniation, and the piston valve,holding against no pressure, works loosely in its hushing,cutting off the admission and guiding the exhaust. As the pojjpet valve controls hoth the inlttand outlet gases, hoth the valve and scat keepcool and need to be ground not over once ortwice a year. The mechanism is simple, andas the roller is always bearing on the camthe valve motion is practically noiseless. By revolving the piston valve by the indexwheel, the blind port S varies the mixtureto suit the gas, whether it has 100 or 1000B. T. U. per cubic foot. The speed of the Sargent engine is con-trolled l)y the well-known Rites inertia gov-ernor in the lly-whcel, which advances tlievalve shaft in time ahead of the crank shaft,1^^^ as t
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