. Farm machinery and farm motors. FIG. 337—GASOLINE TRACTION ENGINE WITH FRICTION GEARING described. This engine is operated by means of a setof friction v/heels, instead of a set of gearing as steamtraction engines are run. Fig. 338 illustrates an enginewhich utilizes pinions for its transmission gearing similarto a steam traction engine. Rating.—Gasoline traction engines are all rated upon 458 FARM MOTORS the horse power they will develop at the brake. Conse-quently when one speaks of a 15 gasoline engine herefers to an engine which will develop only about thesame horse power which a co
. Farm machinery and farm motors. FIG. 337—GASOLINE TRACTION ENGINE WITH FRICTION GEARING described. This engine is operated by means of a setof friction v/heels, instead of a set of gearing as steamtraction engines are run. Fig. 338 illustrates an enginewhich utilizes pinions for its transmission gearing similarto a steam traction engine. Rating.—Gasoline traction engines are all rated upon 458 FARM MOTORS the horse power they will develop at the brake. Conse-quently when one speaks of a 15 gasoline engine herefers to an engine which will develop only about thesame horse power which a commercially rated 7 engine will develop. For this reason when com-paring the powers of the two engines it is always well atleast to double the size of the gasoline engine to do thework which a commercially rated steam traction enginehas been doing. 1. FIG. 338—TRACTION ENGINE WHICH REVERSES IN THE CLUTCH Regulation of speed.—A gasoline traction engine oper-ated by means of friction gearing, as illustrated inFig. 337, can have any speed required of it at the expenseof slippage between the gears. But a positively driventraction engine must have other methods of changingthe speed. These methods generally amount to changing I TRACTION liNGlNES 459 the point of ignition in the engine in order to reduce thepower at low speed, or else shifting the power from oneset of gears to another. Generally in an engine where thepower is shifted there are only two speeds, a high and alow. On the road.—About the same caution should be exer-cised in handling a gasoline traction engine through softand muddy places and over bridges as in handling a steamengine. But there is practically no caution to be takenin climbing hills other than that taken on level descending a hill a strong and efTective brakeshould always be at the control of t
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