r bridge be obtained. constitutes two arched trusses, which will resist de- With extreme ranges of temperature, it is calculated This question was delegated by the Secretary of War formation from strains to considerable extent. that the center of the cables will rise and fall through to the Board… … nearly tbree and one-half times this amount. Thesus- by law. Both piers come inside of this line, so that the pended framework is to be made as rigid as possible. legal channel of the river is not to be interfered with. (Continued on page 323.) The structure is to be of steel for the roadway and…
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