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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 141

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 141
/2 inches. The dotted line 1 shows the diameter,across corners, of a square whose sides measure aninch, and so on. This scale lacks, however, one element, in that thediameter across the flats of a regular polygon being … given, it will not give the diameter across the corners.This, however, we may obtain by a somewhat simi-lar construction. Thus, in Figure 184, draw the lineO \\, and divide it into inches and parts of an EXAMPLES IN BOLTS, NUTS, AND POLYGONS. I4I inch. From these points of division draw…

Mechanical drawing

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