Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 22
—To draw a line, as k I, {Fig. 3,) perpendicular to another,as a 6, set the shortest edge of the set-square at the line, a b;place the ruler against the longest side, (the hypothenuse of theright-angled triangle;) hold the ruler firmly, and slide the set-square along until the side, e d, touches… … Fig. 3. 13.—In drawing a problem, proceed, with the pencil sharpenedto a point, to lay down the several lines until the whole figure iscompleted; observing to let the lines cross each other at theseveral angles, instead of merely meeting. By this, the lengthof every line will be, clearly defined.…
Carpentry · Architecture
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