Mechanical drawing for plumbers; a concise, comprehensive and practical treatise on the subject of mechanical drawing (1910)
Starbuck, R. M. (Robert Macy), 1844-1927 · New York, The Norman W. Henley publishing co. · leaf 55
em, a line of this kind and in suchlocation is made light. Another contradiction arises of a simi-lar nature, in connection with Nos. 3and 4. It would rightly be argued that owingto the wall or shell surrounding the hole,no light would strike the lines represent-ing the rectangular hole, and… … ^ T~>
Plumbing · Mechanical drawing
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