o pier of 233 feet. The gen- and concrete. The beams measure respectively 15 the complete compression of the falsework before the eral plan of the bridge is that of twin supporting arch inches and 20 inches. The latter are riveted to the keying, or closing. By this means, the arch ring was ribs,… … End View. Falsework Pushed Aside. Falsework in Position, Showing Method of Construction. Side View, Showing the Spleudid Arch. THE NEW BRIDGE OVER THE WISSAHICKON AT PHILADELPHIA. ) 1907 SCIENTIFIC AMERICAN, INC.
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