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Tunnels,
breakdown of vehicles in, 57
bridge costs compared, 54
bridges, comparative cost curves
for, 57
bridges, comparative economics,
12, 53
building one pair of tubes at a time,
advantage of, 54
carbon-monoxide gas in, 53
cost of operation, 55
cost of power, 55
depth of descent into, 54
diameters, 53
disagreeableness of traversing, 54, 56
Hudson River, 56
sanitation, 56
separation of entrances and exits, 55
stoppage of traffic, 57
traffic, blockade of, 56
travel in, 53
variation of cost, with
diameters, 53, 57
ventilation, 53
Turning flanges of channels in, 200, 203
Twelfth Street Trafficway Viaduct in
Kansas City, 229
Two-column versus four-column
structures for elevated railroads, 254
Two-pedestal piers, 94
Two-way versus one-way reinforcing
in slabs, 220
Type A cantilevers, 86
Types of military bridges, 464
Typical military bridges, 465
U
Unbalanced wind pressure, 315
Unchecked drawings, 359
Unclassified work, 381
Union Loop Elevated Railroad, 253
Unit-cost records, 385
Unit prices,
alloy steel constituents, 44
bridges, 57
method of contract-letting, 340
various sections, 205
Unit stresses,
determination, 132
economics, 125-140
old bridges, 415
limiting, 410, 411
Unit wind loads, 316
University of Kansas, lectures on
engineering economics, 4
Unloading of materials, 380, 381
Unnecessary transportation,
elimination of, 366
Utilization,
existing bridges, 480
local resources, 480
machinery in shopwork, 202
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V
Vanadium steel, 33, 34
Vancouver, B. C., bridge painting, 439
Variation of cost of tunnels with
diameters, 57
Variations in market price, effect of, 23
Vehicle for paint, best, 435
Velocity of stream, 122
Ventilation for shops, 367, 368
Ventilation of tunnels, 53
Versed sine for cables, 265, 266
Vertical-lift bridges,
bascule comparison, 285-287
bascules, comparative economics
of, 302
base for pavement of, 295
cantilever combination, 295
Duluth, proposed, 310
economics, 291-293
economics of detailing, 294
quantities, 299
records, 297
skewed crossings, 293
supporting cables, 295
swing-span comparison, 284, 285
towers, 294
Viaducts, 217
economics, 250-256
erection, 398
girder depths, 203
reinforced concrete, water-proofing
for, 454
Vibration and jigging of freshly made
concrete, 392, 393
Victory a criterion in military bridge
economics, 462
Visitors to drafting room, 358
Voids, volume of, in aggregate, 386
reduction of, 389
Vredenburgh, Watson, 361
W
Waddell and Harrington axle, 291
Waddell, Montgomery, 12
Wages, flat scale of, 370
Waikato River arch bridge at
Cambridge, N.Z., 247
Waikato River arch bridge at
Hamilton, N.Z., 246
Wakefield piling, 172
Waling frames, spacing of, 172
War,
effect of, on nickel price, 33
engineers in, 459
time element, 460
Warren trusses, economics of, 179
Washout of falsework, 15
Waste not justified in military
bridging, 463
Water,
amount of, for mixing concrete, 392
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