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)
. By moving the triangle to theright -Its edge B will be brought into position to mark 12^ MECHANICAL DRAWING SELF-TAUGHT. line <^, alsopassing through the centre of the circle.All that remains Is to join the ends of these two lines,using the square blade for lines c, d, and the trianglefor e… … Fig. 170. a, Figure 170, passing through Its centre, the triangleof sixty degrees will mark the sides d, c, and d, e, asshown, and the square blade is used {or f,g. The chamfer circles are left out of these figures toreduce the number of lines and so keep the engraving
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
