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)
Fig. 94. A remarkable instance of this kind is shown inFigure 94, when the vertical lines appear to the eyeto be at a considerable angle one to the other, althoughthey are parallel. The lines in sectional shading or cross-hatchingmay be made to denote the material of which the 82 MECHANICAL DRAWING… … Lead. Steel. Wood. Fig- 95-involve very much more labor than it is worth inordinary machine shop drawings, except in the caseof cast iron and wood, these two being shown in the
Mechanical drawing
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