. Farm machinery and farm motors. dhereto the ground, providing the surface is firm enough tosupport the load. This makes the matter of location of the main axles upon theboiler an important the boiler is rear-mounted it is obvious thatmore of the weight isthrown upon the frontwheels, which act as aguide, than when thePjg ^,g boiler is side-mounted. Hence one would be led tobelieve that the side-mounted traction engine will havebetter tractive power than the rear-mounted. It is also in-dicative of better tractive power when the pivot of thefront axle is as far ahead as possible. Fo
. Farm machinery and farm motors. dhereto the ground, providing the surface is firm enough tosupport the load. This makes the matter of location of the main axles upon theboiler an important the boiler is rear-mounted it is obvious thatmore of the weight isthrown upon the frontwheels, which act as aguide, than when thePjg ^,g boiler is side-mounted. Hence one would be led tobelieve that the side-mounted traction engine will havebetter tractive power than the rear-mounted. It is also in-dicative of better tractive power when the pivot of thefront axle is as far ahead as possible. For this reasonsome builders are now attaching a frame to the boilerand crowding the front trucks ahead. Fig. 336 is an illus-tration of this type of mounting. 591. Width of tires.—Where traction engines such asare used for harvesting and threshing grain simultane-ously are used for plow work or in the field an excep-tionally wide tire is required. If an engine is to be usedfor this work exclusively the wheels are made with the i. TRACTION ENGINES 453 proper width of tires at the factory. But where an en-gine is to be used for job threshing a part of the timeand for plowing a part of the time the wheels should bemade so an extra width of tire can be attached to supportthe engine for plowing. 592. Road rollers.—For road rolling purposes tractionengines as a rule, especially the gearing and bearings, aremade much heavier. The tires are wider, and the fronttruck instead of being made of two wheels is made intoone broad wheel. HANDLING A TRACTION ENGINE 593. Moving an engine.—^^llen moving an engine it isbest to carry more water than when doing stationarywork. This is especially true in hilly fields or hillyroads. The gauge glass and water cocks should be care-fully watched. The steam pressure should be maintainednear the blow-off point. Upon approaching a hill judg-ment should be exercised in regard to the fire and amountof water and pressure. As much water should be car-ried
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