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)
210 ME CHA XICA L D RA IVING SEE E- TA UGIIT. screw, p is a bevel pinion, and q a bevel wheel; i\ m,o, 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… … Fig. 248. Figures 252, 253, 254. 255, and 256. The pitch-circleis drawn by the construction for drawing an ellipsethat was given with reference to Figure Si, but asthat construction is by means of arcs of circles, andtherefore not strictly correct, Professor McCord, in anarticle on elliptical…
Mechanical drawing
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