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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 226

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 226
Figures 252, 253, 254, 255, and 256. The pitch-circleis drawn by the construction for drawing an ellipsethat was given with reference to Figure 81, but asthat construction is by means of arcs of circles, andtherefore not stricdy correct, Professor McCord, in anarticle on elliptical gearing, says,… … Fig. 251. 2X2 MECHANICAL DRAWING 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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