Teachers' manual for the Prang course in drawing for graded schools, books 1-6 (1897)
Clark, John Spencer, Prang Company, Hicks Mary D, Perry, Walter Scott · Boston. Prang educ. co. · leaf 159
s at right anglesto each other, and placing the model, or object, in the angle. In observing theshade and shadow, the eyes may be half closed, so as to obtain the general effect. Three planes.— In shading drawings of models seek at first to express onlythree planes : « 1. Plane of light on the face…
Drawing -- Study and teaching
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