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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)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 283

An illustration from 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, leaf 283
made of the same size that the engraving is requiredto be, or otherwise the tracing process described cannotbe used. The wax process is, however, more suitable for en-gravings in plain outline only, and is especially excel-lent when the parts are small and the lines fall closetoo-ether; or when the… … Fig. 295. Fig. 296. It is obvious that all the centres, a, by c, etc., lay onthe line of a circle struck from the centre of the (26S) EXAMPLES FOR PRACTICE. 26g wheel, and the same remark applies to the centres d, e,/, etc. At G is shown a cross-section of one arm of thewheel taken on the line H H.…

Mechanical drawing

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