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)
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… … Fig. 296. line appears in the engraving precisely as it appearsin the drawing. For this kind of engraving die drawing may bemade of any convenient size that is larger than thesize of engraving to be produced, the reduction of sizel)eing produced in the photographing process. Draw-ings for…
Mechanical drawing
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