Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 33
her two. If all threesides of the triangle drawn are not of equal length, the 30° and 60° angles are not accurate.Fig. 6 shows themethod of using thetriangle in connectionwith the T-square, theleft hand manipulatingand holding the triangleand the T-square.The draftsman shouldarrange his work so as… … Fig. 6. — Using the Triangle in Connection withthe T-square.
Mechanical drawing
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