Hartford Steam Boiler Inspection and Insurance Company · Hartford, Ct. : Hartford Steam Boiler Inspection and Insurance Co · leaf 16
: Let7>;/ ;/ and p p p\ Fig. 8, represent portions of the pitch circles of twogears which are to have 59 and GO teeth respectively, as shown. Suppose we wish to layoff the pitch on the pitch circle of the 59-toothed gear. Divide 360, the number ofdegrees in a circle, by 59, the number of teeth… … Fig. 8. double 6° 6 6.1; this gives 12° 12 12.2. Lay ofi the tangent of this angle/e in thesame manner. Treble 6° 6 6.1. This gives 18^ 18 18.3. Lay off its tangent ;>/as be-fore, and so proceed until the tangents of the angles subtended by the required numberof teeth have been determined. Then…
Locomotives · Steam-boiler explosions
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