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. 295. Fig. 296. It is obvious that all the centres, a, d, c, etc., lay on the line of a circle struck from the centre of the (268) EXAMPLES FOR PRACTICE. 269 wheel, and the same remark appHes to the centres d^ e^f, etc. At G is shown a cross-section of one arm of thewheel taken on the line H H.… … Fig. 298. In those cases in which a line can be drawn througha piece of work in such a position that the construc-tion of the piece represented in the drawing is alikeon both sides of the line, the drawing may be madel^alf in elevation and half in section, as is shown inFigures 297, 298 and 299,…
Mechanical drawing
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