Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 48
nd Vertical Lines Appear Unequal. of tlie same length at what is estimated to be a right angle fromit. Test all these points oy T-square and measurement, and DRAWING STRAIGHT LINES. 45 practise similar examples of jiadging lengths, central points, andangles, till the judgment will bear the test of… … Fig. 66.—Equal Spaced Spots Appear Unequal. uniformly spaced, but, to most people, the distance on the right-hand space looks much longer than that on the left, solely byreason of the lines drawn angleways confusing the judgment.Again, in Fig. 67, the two inner horizontal lines crossing theinclined…
Mechanical drawing
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