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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 156

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 156
e cut by a dotted line;hence, we may set a square blade to that angle, andmark in tliese lines, as 26, 27, 28, etc., and the thread^s pencilled in complete. If the student will follow out this example upon SCREW THREADS AND SPIRALS, 155 paper, it will appear to him that after the thread hadbeen… … side. Figure 204 represents a case in which this hasbeen done, and it will be observed that the lines de-noting the bottom of the thread do not meeC the bot-toms of the thread, which occurs for the reason that the

Mechanical drawing

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