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)
gthe dimension across corners, across the flats, or thelength of a side of a given polygon, is by means ofdiagrams, such as shown in the following figures,which form excellent examples for practice. Draw the hne O P, Figure 181, and at a right angleto it the line O B; divide these two lines into… … -/•i •^/2 Fig. i8i. From the point O, draw diagonal lines, at suitableangles to the line O P. As shown in the cut, thesediagonal lines are marked: 40 degrees for 5 sided figures.45 6 49 7 52>< 855>< 9But still others could be added for fiofures havincr agreater number of sides. I. Now…
Mechanical drawing
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