Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 154
F/g. 32/ In many lines of work detail drawings are never shaded and thisseems to be the best practice. Outline drawings or assemblydrawings which serve partly, at least, as picture drawings areoften improved by shading. 136 SHADE LINE DRAWINGS 137 System in Common Use. — In the United States a… … r/g. 3^2 <0 T %- N Fig. 323
Mechanical drawing
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