here is one other pointwhich sometimes troubles the student who attempts to fol- 202 THE MODERN CLOCK. low the expositions of this subject by learned writers andthat is the fact that a mathematician will take a totallydifterent set of numbers for his examples, without explain-ing why. If you dont… … Fig. G5. Spacing off center di-tances; c, ce:; cr of wlieel; e, pitch circle;d, dedenduni; b, addendum; a, center of pinion. our pinion radius. If we turn the foot into inches we have18 inches. 18-f-4.5 = 4, which is simpler to work with.Now the same thing can be done with fractions. In theabove…
Clocks and watches
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