Notes for mechanical drawing; arranged for the use of the students of the Mechanic arts high school and the Evening school of trades (1904)
Mathewson, Frank E. (Frank Elliott), b. 1869 · Springfield, Mass. · leaf 174
in a spherical surface every faces being represented hy A B C and C U E in thepoint is equally distant from a point within called the figure. ihe length of the arc // i? C is equal to thecenter. It therefore follows that n—o must lie upon a circumference of the pitch circle A C, and the… … 0^ To be theoretically exact, the tooth curves should betraced upon the surface of a sphere, as shown in Fis^-.II. This method is not practical, however, and hasno advantage over what is known as Tredgolds ap-proximation, which is much simpler and is universallvused. By this method the tooth curves…
Mechanical drawing
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