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 145
Section on CDBottom \iew Bottom View 134 TEA CHERS MA NUA L. [book IV. long-dash lines , and should be of the same strength as the full lines. By means of these conventions the purpose of these various lines is seen at a glance.Working-lines and invisible lines are shown in the working-drawings of…
Drawing -- Study and teaching
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