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)
mo … Fig. 140. 04 MECHANICAL DRAWING SELF-TAUGHT. when in place upon the machine of which it formja part. Thus in Fio-ure 140 is a lever, and if its shaftstood horizontal when the piece is in place in the
Mechanical drawing
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