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Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work (1910)

Lobben, Peder, 1858- · New York, D. Van Nostrand company · leaf 407

An illustration from Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work, 1910, leaf 407
d by means of the strap, discand scratch awl, as explained in Figs. 2, 3 and 4. When the gear has less than twenty teeth, and is constructedby circular arcs, as shown in Fig. 5, the top of the tooth will betoo thin; but the top of the tooth will be too thick to clear inthe rack, if the true… … *The way to actually draw this curve on paper by means of drawing instru-ments is explained on page 192. This way explained here, using the disc on thestrap, is merely for illustrating and explaining principles, and serves well for thatpurpose, but would be inconvenient to use in actual…

Mechanical engineering

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