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. 293. 262 MECHANICAL DRAWING SELF-TAUGHT. lines, as a, b, c, etc.; and from these lines draw hor-izontal lines d, e,f, etc. Now divide the lower half ofcircle D into twice as many equal divisions as quartercircle K is divided into, and from these points of di-vision draw perpendiculars g, h, iy… … Molding Fig. 294. If the student will, after having drawn the curve bythis construction, draw it by the construction that wasexplained in connection with Figure 79, he will findthe two methods give so nearly identical curves, thatthe latter and more simple method may be usedwithout sensible error.…
Mechanical drawing
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