Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 87
Fig. 139. Fig. 140. circles. Find the shadows of these circles on the groundplane (see principle 2). The curve enveloping these circular ,shadows is the required shadow. The line of shade canbe found by drawing light rays from the points where thecircular shadows are tangent to the envelope back to…
Geometry, Descriptive
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