Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 79
r-poses, is wholly unfit for mechanical pur-poses, and therefore we must have a methodthat is not dependent on personal skill. THE ELLIPSE. If the ellipse is drawn by means of thetrammel, Fig. 124, it can be accurately spacedby means of a graduated index circle I, hav-ing a diameter equal to the… … Fig. 128. and that is elsewhere very nearly in the sameproportion. This method is not mathematically exact,but its accuracy is very far within the re-quirements of practice. The space on thequarter, at Q, will be greater than anywhereelse, but the maximum error will in generalbe very minute. For an…
Gearing
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