Encyclopedia of architecture : a dictionary of the science and practice of architecture, building, carpentry, etc., from the earliest ages to the present time, forming a comprehensive work of reference for the use of architects, builders, carpenters, masons, engineers, students, professional men, and amateurs (1852)
Nicholson, Peter, 1765-1844, Lomax, Edward, Gunyon, Thomas · New York : Johnson, Fry & Co. · leaf 326
.—Suppose it were required toconstruct a curb roof to have the bottom rafter to the upperrafter as 2 to 3, to a given vertical angle at the top, and agiven width a b. Now the weight on the upper angle is to the weight on = 3 is ., , , 2 H I . . H I + I A ,, . . 3 + 3 the lower angle, as is to .… … FiffJ^ C ^^ ^ ~~\ n--^ R \>- --JO \ / j^ \Ar-A y / 1 /*^ I G O HE A O CUR 219 CUR A E c equal to half the vertical an<;le, or the angle e a c, equalto its complement. Make e d to e c as 5 to c ; join d a andD B; in AD, take any point, f ; draw f g parallel to a k,making a f to f g as 2 to 3;…
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