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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 161

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 161
Fig. 208 a. the order of procedure being, shown in Figure 209.The lines for the full diameter of the thread being … Fig. 209. drawn, the pitch is stepped off by arcs, as 1,2, 3, etc.,and from these, arcs, as 4, 5, 6, etc., aie marked forthe width of the flat places at the tops of the threads. SCREW THREADS AND SPIRALS. i6l Then one side of the thread is marked off by lines, as7, which meet the arcs i, 2, 3,…

Mechanical drawing

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