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)
tdngthe 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. X Draw the line O P, Figure 181, and at a right angleto it the line O B; divide these two lines… … 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 S2}4 • 8 55>^ 9 But still others could be added for ficrures havinor agreater number of sides. i. Now it will be…
Mechanical drawing
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