The theory and practice of modern framed structures : designed for the use of schools, and for engineers in professional practice (1897)
Johnson, J. B. (John Butler), 1850-1902, Bryan, C. W. (Charles Walter), 1863-1927, Turneaure, Frederick Eugene, 1886- · New York : J. Wiley & Sons · leaf 81
he arc of a parabola. The bracing may be as inFig. 105, or as shown in Fig. 107. Formerly this truss was quite extensively used, but poordetails and the difificulty of making it rigid against wind-pressure have caused it to be generallyabandoned. However, as the analysis has several interesting… … load the moments vary as the ordinates to a parabola, and likewise these verticals or lever-arms ; hence their quotient is the same for any chord member, and may be written as themoment at the centre divided by the centre height of the truss. \{ n — number of panels,p = load per foot, /i = height…
