Economics of bridgework, a sequel to Bridge engineering (1921)
Waddell, J. A. L. (John Alexander Low), 1854-1938 · New York, J. Wiley · leaf 342
which the types are equal will be reduced; and with agreater down-clearance it will be increased. 302 ECONOMICS OF bridgework: Ch.\pter XXX The curves of Figs. 30e and 30/ are based upon the assumption that,for the vertical hft span, the motors, operating machinery, and machineryhouse are located… … 140 160 130 200 Z20C/ear Channe/ in Feef 240 260 2(30 JOO Fig. 30e. Comparative Costs of Double-Track-Railway, Vertical-Lift Bridges andSingle-Leaf, Heel-Trvmnion Bascules. cheaper to place the said machinery in the towers. If this be done, theclear heights at which the cost of the vertical lift…
Bridges
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