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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 224

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 224
igures 246 and 247 at D, F, G, K, P, H, I andJ, were drawn as shown. The pitch circles, how-ever, are usually drawn In red ink to distinguishthem. —^ /a= Fig. 247. In Figure 248 is an example in which part of thegear is shown with teeth in, and the remainder is Illus-trated by circles. In Figure… … 210 MECHANICAL DRA IVIXG SELF- TA UGHT. screw, / Is a bevel pinion, and q a bevel wheel; i, m,c\ are gear wheels, and y a worm operating a worm-pinion and the gears shown. All these wheels and pinions are merely line-shadedin Figures 250 and 251 on account of their being toosmall to have the teeth…

Mechanical drawing

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