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)
truments thathave become dull by use, for in that case the edgeswill be found quite bright, and any inequality of thick-ness shows plainly. It follows, from what has been said, that the needle-point and pen-point should stand vertical when in use, PREPARATION AND USE OF INSTRUMENTS. 43 and to…
Mechanical drawing
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