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)
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 … given, but suppose the diameter across the Hats were and the construction is a little more complicated. Circle a, a, in Figure 175, is drawn of the required diameter across the flats, and the lines of division are EXAMPLES IN BOLTS, NUTS, AND POLYGONS. ^1 drawn across with the triangle of 60 as…
Mechanical drawing
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