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 (1883)
on referring to circle A. P)Ut it will be notedihat the length o^ diagonal line 45 degrees, enclosedb(;tween tlie point O and die arc of circle from i onO B to one on () P, measures also an inch. Hence EXAMPLES IX BOLTS, XUTS, AXD POLYGOXS. 139 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
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
