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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 155

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 155
o c;we therefore draw line 16 at a right-angle to the cen-tre line, and a line that touches the top of the threadsat a. where it meets line 2. and also meets line 16.where it touches line 3, is the angle or slope for thetops of the threads, which may be drawn across bylines, as iS, 19, 20, etc.… … There now remain the bottoms of the thread todraw, and this is done by drawing lines from the bot-tom of the thread on one side of the bolt to the bot-tom on the other, as shown in the cut by a dotted line;hence, we may set a square blade to that angle, andmark in these lines, as 26, 27. 28, etc.,…

Mechanical drawing

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