Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 47
65, each of the twolines being exactly 2 in. long. Now study it attentively from adistance; at first the vertical stroke will seem much longer thanthe horizontal one, but by comparing the parts carefully it willbe seen that the first impression was not a true one. Now, withone edge of a set-square,… … Fig. 64.—Drawing Parallel and Perpendicular Lines with T-squareand 2-ft. Rule. Fig. 65.—Equal Horizontal and 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…
Mechanical drawing
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