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 398
ame movement in all of the rollers at the same time.The safe load on friction rollers is given by the formula / = 600 Art. 255. Forhard-steel rollers on cast-iron beds use /» = 500^^^- For conical rollers use the averagediameter for d. The bearing on the masonry at the centre may be taken at the… … This form of centre bearing was invented by Mr. Wm. Sellers, and is known as the Sellers Centre. 360 MODERN FRAMED STRUCTURES. the masonry is 300 lbs. per square inch for fixed spans, then for swing bridges it would applyonly when the bridge is closed and fully loaded. When the bridge is empty and…
