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)
URVES. 7* centre h draw the arc p 0 q. With radius a I and fromb and c as centres, draw arcs cutting p 0 q at the pointsp q. Draw the lines h p r and h q s and also the linespit and q v w. From /z as a centre draw that partof the ellipse lying between r and s, with radius/ r ;from p as a centre… … v w, and from z^ as a centre draw the ellipse from zuto c, and one-half of the ellipse will be drawn. It willbe seen that the whole construction has been per-formed to find the centres /i,p, q, /and v, and that whilev and i may be used to carry the curve around on theother side of the ellipse, new…
Mechanical drawing
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