Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 40
Fig. 77. edge of the ruler, and a third line be drawn touching A B, the figure con-structed will be a rectangle; and if E D be laid off on A B, equal to C E, thefigure inclosed is a square (Fig. 79). It wili be seen that the triangle and ruler afford a much readier way of A … Fig. 78. Fig. 79. drawing parallel lines, and lines at right angles, than the compasses and ruler,and may be used in solving the following problems: The area of a figure is thequantity of space inclosed by itslines. Construct a right angle (Fig.80). Divide the base and theperpendicular by dividers…
Mechanical drawing
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