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)
given what is termed a quarter twist. It will be observed that by the line-shading eventhe twist of the belt is much more clearly shown thanit would be if left unshaded. An excellent example of shading is given in Figure296, which is extractc^l from the Anicrican Macliiiiist,and represents a… … Fig- 295- 266 MECHANICAL DRAWING SELF-TAUGHT. The dravvlnos from which encrravino^s are made aredrawn to conform to the process by which the engrav-iiig is to be produced. Drawings that are shaded byplain lines maybe engraved by three methods. First,the drawing may be photo-engraved, in which…
Mechanical drawing
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