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. 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… … Fig. 251. 2I2 MECHAXICAL DRAWIXG SELF-TAUGHT. divided with great facility and accuracy by a verysimple process, which we take from Prof. RankinesMachinery and Mill Work, and is illustrated in Fig-ure 252. Let O B be tangent at O to the arc O D,of which C is the centre. Draw the chord D O, bisectit…
Mechanical drawing
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