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)
Fig. 178. then lines c to d, and c and d to e, where A meets, thecircle will describe a trigon. If the figure is to standvertical, all that is necessary is to draw the line a … vertical, as in Figure 180. A ready method of gettingthe 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 fioures,which form excellent examples for practice. \ Draw the line O P, Figure 181, and at a right…
Mechanical drawing
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