Soundings in Niagara Gorge and Under the Falls. Top of Tower Showing Temporary Timber Structure. Strands and Plac The Footwai The Two Men Are Standing on a Pair of the 6 x 12 Inch Fioorbeams Which Support the Footways. They Are 155 Feet Above the River. ERECTING THE CONSTRUCTION FOOTWAYS OF THE MANHATTAN BRIDGE. BUILDING THE FOOTWAYS FOR THE STI, scientific american, 1908-08-01
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