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The difference of tractive power in summer and winter must be immense, and the great disadvantage of mechanical, as compared with animal draught, is its want of adaptability to the exigencies of an ordinary road.
We know that for a given transverse or midship section, the tractive stress necessary for the progression of the ship is proportional to the square of the velocity; and the motive power, as a consequence, to the cube of such velocity.
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