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)
aswill be seen on referring to circle A. But it will be notedthat the length of diagonal line 45 degrees, endbetween the point O and the arc of circle from 1 onto one on O P, measures also an inch. Hence EXAMPLES IN BOLTS, NUTS, AXD POLYGONS. i^g we may measure the radius along the diagonal linesif… … Fig. 183. which the length of the side of the polygon is the dis-tance from the line O B, measured horizontally to thediagonal, corresponding to the number of sides of thepolygon. The radius across corners of the polygonis that of the distance from O along O B to the hori-zontal line, giving the…
Mechanical drawing
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