Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 856
the rack be bounded by a right lineh D E, making an angle B D M with the pitch line equal to B c h, and the involute h b be moved intothe position h b, it will drive the sloped tooth to the position P m, always touching it in the line h c H;and the velocity of the circumference of the pitch circle… … \ I i I I tf radius of base BA = sin 0.
Mechanical engineering
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