Augsburg, De Resco Leo, b. 1859 · Boston, New York, Educational Pub. Co · leaf 79
object rests,having no lines to represent it, may be regarded as weak. In Fig. 3, face A is represented by four lines, therefore needsno shade to strengthen it. Face B is represented by only twolines, hence is regarded as weak and is shaded. Faces C and Dare weak where they are covered by face A,… … Curved faces are always weak, haviiiir <iiiy one and never morethan two lines to indicate the curvature, hence they may be shaded. Note.— See the cliapter on Wash Drawing in Boole III. for fnll directions inshading. Fig. 4 is a box with the faces marked with letters. Drawthis box and remove the…
Drawing
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