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)
draw circlesthrough the points of division. Draw the outer circleand divide its circumference into twice as many equaldivisions as the line A B was divided into. Drawradial lines from each point of division on the circle,and the points of intersection of the radial lines withthe circles are points… … Fig. 86 A. In Figure 86 A we have this pitch line, and at Rthe roller for the cam, a pair of compasses are set tothe radius of the roller, and from a number of pointson the pitch line A B, as at E, F, arcs of circles aredrawn, and touching these arcs a line may be drawnrepresenting the actual or…
Mechanical drawing
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