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 846
ference of thearc dd. A portion of a circular plate D is next provided, of the same radius which it is proposed to giveto the generating circle: this plate has a fine tracing point at p inserted into it, and projecting slightly GEERING. 835 from its under surface, and accurately coinciding with its… … the pitch, the generating circle D is made to rollupon the convex edge of B; meantime the pointat p will trace upon the board the curve of the fa-ces of the tooth, having caused the point to coin-cide successively with the two points a and c, andthe circle to roll from right to left, and vice…
Mechanical engineering
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