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 (1883)
little practice the clickof the spring in the notches becomes a sufficient guidefor adjustment, without reference to the figures on thescrew-head. Another meritorious feature of this penis that it is armed with sapphire points, which retaintheir sharpness very long, and thus save the time andlabor… … Fig. 103. Shading by means of lines may be used with excel-lent effect in mechanical drawing, not only to distin-guish round from flat surfaces, but also to denote tothe eye the relative distances of surfaces. Figure 104 S6 MECHANICAL DRAWING SELF-TAUGHT. represents a cylindrical pin line shaded.…
Mechanical drawing
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