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Fig. 5a. Economic Limiting-Values of r r' for Simple-Span, Steam-Railway
Bridges ---- 28
Fig. 5b. Economic Limiting-Values of rr' for Cantilever, Steam-Railway
Bridges ---- 29
Fig. 5c.Total Weights of Metal per Lineal Foot of Span for Double-Track,
Steam-Railway, Cantilever Bridges of Carbon Steel and Alloy-Steels
of Various Elastic Limits ---- 31
Fig. 5d. Diagram Showing Comparative Economics of All Procurable, or Prac-
tically-Possible, high-Alloy Steels for Long-Span, Cantilever Bridges -- 32
CHAPTER VI
COMPARATIVE ECONOMICS OF BRIDGES AND TUNNELS
Fig. 6a. Diagram of Total Costs of Highway and Electric-Railway Bridges
and Tunnels, with their Approaches, for Crossings Similar to that of
the North River at New York City ---- 58
CHAPTER XI
COMPARATIVE ECONOMICS OF CONTINUOUS AND NON-
CONTINUOUS TRUSSES
Fig. 11a. Layout of Petit-Truss, Continuous Spans ---- 76
Fig. 11b. Layout of Petit-Truss, Non-Continuous Spans ---- 76
Fig. 11c. Layout of Subdivided-Triangular-Truss, Continuous spans ---- 79
Fig. 11d. Layout of Subdivided-Triangular-Truss, Non-Continuous Spans ---- 79
CHAPTER XII
COMPARATIVE ECONOMICS OF SIMPLE-TRUSS AND
CANTILEVER BRIDGES
Fig. 12a. Typical Layouts for Double-Track-Railway, Cantilever Bridges ---- 85
Fig. 12b. Comparative Weights of Metal for Double-Track, Simple-Truss
Bridges and Type-C-Cantilever Bridges ---- 86
Fig. 12c. Comparative Weights of Metal for Double-Track, Simple-Truss
Bridges and Type-A-Cantilever Bridges ---- 87
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