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 273
le are found in the same manner as directed for others. Fig. £ is a sky-light whose plan is trapezoid ; upon each end as a diameter describe a semicircle tocut the ridge line; from these points draw lines to the extremities of their respective diameters, which willform a right angle for the base of…
Carpentry
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