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)
in the thread, it enhances the appearanceto give the bottom of the thread and the right-hand XICAL DRA, HT. side of the same, heavy shade lines, as in Figure 202,a plan that is usually adopted for threads of large di-ameter and coarse pitch. A double thread, such as in Figure 205. is drawn inthe… … Fir. 207. thread, is drawn by single lines, as in Figure 206.A left-hand thread. Figure : obviously drawn by the same process as a right-hand one, except that theslant of the thread is given in the opposite direction. For screw threads of a larQ-e diameter it is not un- common to draw in the thread…
Mechanical drawing
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