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Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1883)

Rose, Joshua · Philadelphia, H.C. Baird & Co.; London, S. Low, Marston, Searle & Rivington · leaf 129

An illustration from Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers, 1883, leaf 129
Fig. 170. a, Figure 170, passing through Its centre, the triangleof sixty degrees will mark the sides d, c, and d, e, asshown, and the square blade is used {or f,g. The chamfer circles are left out of these figures toreduce the number of lines and so keep the engraving … Fig. 171. cle^r. Figure 171 shows the method of drawing ahexagon head wIkmi the diameter across corners is EXAMPLES IX BOLTS, NUTS, AXD POLYGOXS. 129 given, the lines being drawn in the alphabetical ordermarked, and the triangle used as will now be under-stood. It may now be pointed out that the…

Mechanical drawing

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