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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 157

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 157
ances the appearanceto give the bottom of the thread and the right-hand 1^6 MECHANICAL DRAWING SELF-TAUGHT. 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… … Fig. 207. thread, is drawn by single lines, as in Figure 206.A left-hand thread, Figure 207, is obviously drawn bydie same process as a right-hand one, except that theslant of the thread is given in the opposite direction. For screw threads of a larcre diameter it is not un-common to draw in the…

Mechanical drawing

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