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 211
he distance between,them, describearcs intersecting below MN at 3. Draw O3 ; this will be the required perpendicular. Problem 8. — To Jraw a perpendicular at the end of a given line. Let PQ be the given line. With P as centre, and any radius, describe abouttwo thirds of a semicircle, the right end… … / .
Drawing -- Study and teaching
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