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Fig. 21a. Diagram of Increase in Weight of Metal for Each Excess Pound
of Extraneous, Uniformly-Distributed Load in Simple-Truss Spans 196
Fig. 21b. Diagram of Increase in Weight of Metal for Each Excess Pound of
Extraneous, Uniformly-Distributed Load in Type-A-Cantilever
Bridges 197
CHAPTER XXIV
ECONOMICS IN DESIGN FOR ERECTION CONSIDERATIONS
Fig. 24a. Trough-Floor Construction for Easy Field-Riveting 214
CHAPTER XXVI
ECONOMICS OF STEEL ARCH-BRIDGES
Fig. 26a. Economic Ratios of Depth of Arch-Rib to Span Length 236
Fig. 26b. Effects on Rib-Weights from Using Uneconomic Rib-Depths in
Braced-Rib Arches 236
Fig. 26c. Ratio of Weights of Metal in Hingeless Arches as Compared with
Three-Hinged Arches for both Railway and Highway Bridges 237
Fig. 26d. Percentages to Apply to Weights of Metal in Trusses of Simple-Truss
Spans in Order to Find the Weights for Arch-Ribs and the Superim-
posed Columns, with their Bracing, to Carry the Same Live Loads 238
Fig. 26e. Weights of Metal in Double-Track, Steam-Railway, Long-Span Arch
Bridges of Carbon Steel for Class-60 Live-Load 241
Fig. 26f. Economics of Solid-Rib Arches, with Columns and Bracing, for Steam
Railway Structures, in Relation to Ratios of Rise to Span-Length 242
Fig. 26g. Economics of Solid-Rib Arches for Steam-Railway Structures (Ribs
Alone Considered), in Relation to Ratios of Rise to Span-Length 243
Fig. 26h. Economics of Braced-Rib Arches, with Columns and Bracing, for
Steam-Railway Structures, in Relation to Ratios of Rise to
Span-Length 244
Fig. 26i. Economics of Braced-Rib Arches for Steam-Railway Structures (Ribs
Alone Considered), in Relation to Ratios of Rise to Span-Length 245
Fig. 26j. Canadian Northern Pacific Railway Bridge over the Fraser River at
Lytton, B. C 246
Fig. 26k. Arch Bridge over the Waikato River at Hamilton, N. Z. 246
Fig. 26l. Arch Bridge over the Waikato River at Cambridge, N. Z. 247
Fig. 26m. Arroyo Seco Bridge at Pasadena, Calif. 248
Fig. 26n. Colorado River Bridge at Austin, Texas 249
CHAPTER XXVII
ECONOMICS OF STEEL TRESTLES, VIADUCTS, AND ELEVATED RAILROADS
Fig. 27a. Economic Span-Lengths for High, Single-Track-Railway Trestles 251
Fig. 27b. Economic Span-Lengths for Low, Single-Track-Railway Trestles 252
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