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Of placing the Carridge. 247

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ſlxed, ic muſt be kept, while working, in the poſition for which it was drawn« Therefore when the axle is fixed tó the body of the carriage, and that body 1s io placed as to be level when going up- on level ground, the axle muſt be fixed with the plane of its upper ſide parallel to the body of the carriage When the axle is fitted to the ſhafts, it muſt be conſidered how much higher the ſhaîts will be at the back band than at the axle, when the carriage 1s going upon level ground. This may be known from the height of the wheels, and the height of the horſe,(ſce fig, 10.) Let a ce repreſent one of the ſhafis, a È the height at the back band, and bc d a level line paſling through the upper

fide of the axle. It is plain, that to keep