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 (1883)
Fig- 173- square, and lines b, c and d from the triangle of forty-five degrees; the lines to be inked in to form an oc-tagon need not be pencilled, as their location is clearlydefined, being lines joining the ends of the linescrossing the circle, as for example, lines e,f. Let it be required to…
Mechanical drawing
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