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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 168

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 168
ef, etc. These lines giveat their intersections with the lines C and B the cen-tres for the half circles g, which being drawn, the sides//, z,y, k, etc., of the spring, may all be marked in. Bythe lines m, 11, 0, p, the other sides of the spring maybe marked in. SCREW THREADS AND SPIRALS. 167 The… … for threads. It may be pointed out, however, that toobtain as accurate a division as possible of the linesthat divide the pitch, the pitch may be divided upon i6S MECHAXICAL DRAIVIXG SELF-TAUGHT. a diagonal line, as F, Figure 216, which will greatlyfacilitate the operation.

Mechanical drawing

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