Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 75
nes perpendicular tothe diameter across the surface to be represented.It is not absolutely necessary that the central spaceshould be equal to the others; it will be moreeffective to leave out two of the lines, and makeit to this extent wider. To construct a mass of equal squares (Fig.158). Lay off… … FiG. 157. Or, construct a rectanarle tances apart, as may be necessary; through these points draw the lines.To construct the squares diagonally to the lase (Fig. 159). DRAWING INSTRUMENTS. 59 Mark on the sides of the right angle as many points, at distances apartequal to the diagonal of the…
Mechanical drawing
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