The carpenter's new guide: being a complete book of lines for carpentry and joinery (1848)
Nicholson, Peter, 1765-1844. [from old catalog], Johnston, William, architect. [from old catalog] · Philadelphia, Grigg, Elliot and co. · leaf 94
and over a b; draw the chords a 4 and 4 m at the angles, make a 9, 4 h, perpen-dicular to them, each equal to half the height d e, at B or F, draw the hypothenuse g 4,and h m, draw the perpendicular ordinates from the chords through the intersection of theother lines that meet at the angles, then… … Plate 27.
Carpentry
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.