Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 42
n from left to right in drawinglines, which are horizontal or nearly so, frombottom to top in drawing lines which are verticalor nearly so, and in either direction (depend-ing upon the angle) in drawing inclined lines(see Fig. 19). Always hold the pen so that a Fig. 19.-Direction in \ 07/ ^ J ^ r-… … Fig. 18. — Using the Ruling Pen.
Mechanical drawing
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