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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 (1889)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · 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, 1889, leaf 129
Fig. 170. a, Figure 170, passing through its centre, the triangleof sixty degrees will mark the sides b, c, and d, e, asshown, and the square blade is used ior f, g. The chamfer circles are left out of these figures toreduce the number of lines and so keep the engraving … Fig. 171. clear. Figure 171 shows the method of drawing ahexagon head when the diameter across corners is EXAMPLES EV BOLTS, XiTS, AXD POLYGONS. 129 oflven, the lines being drawn in the alphabetical ordrrmarked, and the triangle used as will now be under-stood. It may now be pointed out that the…

Mechanical drawing

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