Inside Out Library
Scientific American, Vol. 31, No. 24 (1874) (1874)
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es, are foot walks 5 feet wide, protected by trated on p. 823, vol. 30. The builders were the Keystone | feet 6 inches; eight spans varying in length from 148 feet Bridge Company of Pittsburgh, Pa., and the designs of the | 4,22 inches to 171 feet 6 inches; total length, backwall to back- light and… … © 1874 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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