Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 503
Fig. 1150. the ridge above the plate is ^, J, f, etc., of the span of the roof at the level ofthe plate. The steeper the pitch of the roof, the less the thrust against the … Fig. 1151 side-walls, the less likely the snow or water to lodge, and consequently thetighter the roof. For roofs covered with shingles or slate, in this portion ofthe country, it is not advisable to use less than ^ pitch ; above that, the pitchshould be adapted to the style of architecture…
Mechanical drawing
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