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)
second, that as the dimensionsof the ellipses increase, the centres for the arcs fallnearer to the axis of the ellipse. Now in proportionas a greater number of arcs of circles are employedto form the figure, the nearer it will approach theform of a true ellipse; but in practice it is not usualto… … Fig. 79. fall on the line of the major axis, two on the line ofthe minor axis, and the remaining four elsewhere. In Figure 79 is a construction wherein four arcs areused. Draw the line a b, the major axis, and at a CHANICAL L. 3 SELF-TAUGHT. [ angle to it the line c d, the minor axis of thej. Now…
Mechanical drawing
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