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
Mechanical drawing
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