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)
across corners, across the flats, or thelength of a side of a given polygon, is by means ofdiagrams, such as shown in the following fioures,which form excellent examples for practice. \ Draw the line O P, Figure 181, and at a right angleto it the line O B; divide these two lines into parts ofone… … Fig. 1S1. 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^ S 0072 9 But still others could be added for figures having a- number of sides.Now it will be found as…
Mechanical drawing
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