Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 167
)lane of the projection, the shadow being thrown upon two plane surfaces at an angle to each otl>er. 150 SHADES AND SHADOWS. In every drawing where the shadows are to be inserted, it is of the utmostimportance that the projections which represent tiie object whose shadow isrequired, and the… … Fig. 301. Fig. fined by lines drawn lightly in India ink, and, to prevent mistakes, erase allpencil marks before proceeding to the operations determining the lines ofshadow. JlITLO
Mechanical drawing
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