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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)

Rose, Joshua · Philadelphia, H.C. Baird & Co.; London, S. Low, Marston, Searle & Rivington · leaf 44

An illustration from 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, leaf 44
thave become dull by use, for in that .case the edgeswill be kn\\\<\ i\\\\w bright, and any inequality of thick-ness sliows plainly. It follow.s, from what has been said, that the needle-poiU .ind j)cn-p()inl Ji.-nl,] stand \-criieal whm in use, PREPARATION 4XD USE OF INSTRUMENTS. 43 and to…

Mechanical drawing

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