Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 265
ntinues, inthe shadow of that line, to h. Similar cases occur at /, jand k\ and in general, wherever a shade line is crossed by ashadow. Such a point is known as a point of loss. The linefg is a shade line, the umbra of which coincides with the sur-face gopq; hence this surface is dark. The rest of… … Fig. 231 XII, § 210] SHADES AND SHADOWS 249 general, two drawings are required to give the necessary informa-tion. For the most part, shadows are used in connection withelevations or sections. The plan is used merely to assist in thework, and the shadows on it are not often drawn in. Sometimes itis…
Geometry, Descriptive
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