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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 131

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 131
Fig. 174, or whatever the triangle is rested on, is always acorner of a polygon having twelve sides. ^ In both of these examples we have assumed thatthe diameter across corners of the polygon was … Fig. 175-given, but suppose the diameter across the flats weregiven, and the construction is a litde more complicated.Circle a, a, in Figure 175, is drawn of the requireddiameter across the flats, and the lines of division are EXAMPLES EV BOLTS, NUTS, AND POLYGONS. 131 drawn across with the…

Mechanical drawing

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