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)
e on the taper stem. And the curvedlines, as A, B, may be drawn in by a curve that mustmeet at the line C, and also in a rounded point atline D. CHAPTER VIII. SCREW THREADS AND SPIRALS. The screw thread for small bolts is represented bythick and thin lines, such as was shown in Figure 152.but in… … Fig. 202. drawn, set the compasses to the required pitch of the thread, and stepping along line 2, mark the arcs 4, 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…
Mechanical drawing
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