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)
5, 6, etc., for the full length the thread is to be marked. With the triangle resting against the f- square, the lines 7, 8, 9, etc. (for the full length of the thread), are drawn from the points 4, 5, 6, on line 2. These give one side of the thread. Reversing the drawing triangle, angles 10, 11,… … passes set on the centre line transfer this depth to theother side of the bolt, as denoted by the arcs 13 and14. Touching arc 14 we mark line 15 for the thread 154 ME CHAXICAL DRA V, rING SEE F- TA UGHT. depth on that side. We have now to get the slant ofthe thread across the bolt. It is obvious…
Mechanical drawing
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