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)
e lines within the circle in Figure 173,except a, for which the square blade is used; the onlylines to be inked in are such as b, c. In this examplethere is a corner at the top and bottom, but supposeit were required that a flat should fall there insteadof a corner; then all we have to do is to set… … or whatever the triangle is rested on, is always acorner of a polygon having twelve sides. \ In both of these examples we have assumed thatthe diameter across corners of the polygon was
Mechanical drawing
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