Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 44
duced. If, however, the board benot square, a true T-square will not enable a square drawing tobe made, as wull be seen by Fig. 60, where the T-square is correctbut the drawdng-board is not square, causing the intended hori-zontal and vertical lines drawm upon it to have an angular errorthe same as… … Fif?. 60.—Untrue Boari makes Incorrect Angles. corner, hold the T-square firmly on the board, as shown inFig. 61, and with the set-square against the top edge draw linesa 6, a c, wdiich will coincide if the squares are true, or may showany of the errors depicted in Fig. 61. This edge should then…
Mechanical drawing
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