Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 49
en part of thelower half is covered, it looks as if much more than the coveredpart is missing. In Figs. 70 and 71 the two circles are preciselythe same size, but the black on a w4iite ground looks smallerthan the white on a black ground. This appearance is caused 46 PRACTICAL DRAUGHTSMENS WORK.… … Fig*. 68.—Parallel Lines Appear to Converge and to Diverge.
Mechanical drawing
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