Economics of bridgework, a sequel to Bridge engineering (1921)
Waddell, J. A. L. (John Alexander Low), 1854-1938 · New York, J. Wiley · leaf 204
kindly investigated this question for the author;and in a letter dated January 29th, 1920, he reports as follows concerning adouble-track, steam-railway bridge, 1,200 feet long, for which the metalerected is assumed to cost 1 .^i per lb.: After careful study I feel that the three equal spans and… … // 7J 14 15 /.6 1.7 1.8 1.9J^af/os of Len^f/) ofAf/dd/e Span fo fhahf (fi^era(je Jpan Fig. 18i. Diagram of Weight-Ratios showing Effect of Lengthening the Central Spanof any Simple-Truss, Three-Span Layout, Keeping the Total Length Unchanged. and one of 600 feet I would reduce the price $1.00 per…
Bridges
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