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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 (1889)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 163

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, 1889, leaf 163
getting both curves, the divisions from ^ to ^and from <? to/being taken up by the fiat top andbottom of the thread. It will be noted that in Fieure207, the top of the thread is drawn first, while in Fig- 162 MECHANICAL DRA WING SELF- TA UGHT. ure 208 the bottom is drawn first, and that in… … Fig. 210. sents the centre line and 2, 3, 4 and 5, the diameterand depth of the thread. The pitch of the thread ismarked off by arcs, as 6, 7, etc., or by laying a rule di-rectly on the centre line and marking with a lead pen-cil. To obtain the slant of the thread, lines 8 and 9are drawn, and from…

Mechanical drawing

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