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)
tted line 2 shows 140 MECHANICAL DRAWING SELF-TAUGHT. the length of the side of a nine-sided figure, of 2-Inch radius, the radius across corners of the fio^urebeing 2 inches. The dotted line 2 j^ shows the length of the side of anine-sided polygon, having a radius across corners of2^ inches. The… … Fig. 1S4. criven, it will not give the diameter across the corners.This, however, we may obtain by a somewhat simi-lar construction. Thus, in Figure 1S4, draw the lineO B, and divide it into inches and parts of an EXAMPLES IN BOLTS, NUTS, AND POLYGONS. 141 inch. From these pohits of division draw…
Mechanical drawing
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