International photographer (Jan-Dec 1935)

Twenty-four The INTERNATIONAL PHOTOGRAPHER January. 1935 provided at all points where traffic enters or crosses these roads. The roads are highly scenic and have easy grades and curves, notwithstanding the difficult character of the terrain. The total traffic capacity of the bridge is over 283,000 machines every 24 hours, but the earning capacity for the first year of operation is based on only 5870 machines every 24 hours — less than one-fortieth the capacity provided. The construction period is 4 years and the man hours of work will be 9,700,000 in the mills and shops; 2,-000,000 in the mines and quarries ; 6,600,000 in field work ; 5,600,000 in transportation of materials ; 300,000 in cement mills and 800,000 miscellaneous. Contribution to the Art of Bridge Design The bridge is unique in that its architectural treatment was assigned a position of primary importance — nor was beauty sacrificed to arbitrary design standards and rigid economy. The structural conception as a whole is adjusted to its scenic environment and is carried out in full symmetry longitudinally and transversely. The bridge is perhaps the first in which the importance of the new motif of stepped-off towers has been recognized and applied. The bridge is also the first in which the network of transverse bracing between the tower posts is eliminated and the towers portal-braced throughout, making the tower effect that of a majestic doorway. The San Francisco pier is the first bridge pier to be built in the open sea under new methods, specially devised, chief among which is a unique steel and concrete cofferdam 115 feet in height, built in place, section by section, 27^ feet thick at bottom, with its top 15 feet above water, remaining in place as a permanent fender to enclose the pier and protect it from possible impact of passing ships. The piers proper are huge concrete monoliths, carried out architecturally to match the accentuated vertical lines of the tower posts and the structure as a whole. The anchorages, with their towering concrete fascia walls, and their concrete pylons, 250 feet in height are as impressive and striking architecturally as the main towers. The bridge incorporates modern lighting effects as a ma;or element of design. The cables are to be outlined in lights their entire length and the towers flood-lighted, making the electrical display at night a brilliant and impressive spectacle. (Left) The Newsreel men make an attack on the new Golden Gate Bridge. (Right) Frank Vail getting a wide angle shot more than 500 feet up. St„le --. -^rflflfflniTn^ _-^T1TlffiriTV^ ^^r Length of Main Structure . . Height of Towers above Water . . Depth of Pier below Water . . . Mam Span 4200 feet 89-10 feet 746 feet 100 feet THE GOLDEN GATE BRIDGE SAN FRANCISCO Length of Main Structure . Height of Towers above Wat Depth of Pier below Water Main Span 3500 feet 5600 feet 595 feet 75 feet '^llb&kM GEO. WASHINGTON BRIDGE NEW YORK CITY, N. Y. Length of Main Structure . . Height of Towers above Water Depth of Piers below Water Main Span 1850 feet 36 10 feet 378 feet 100 feet ^J^Ap? AMBASSADOR BRIDGE DETROIT. MICH. Length of Main Structure . . Height of Towers above Watci Depth of Piers below Water . Main Span 17.50 feet 575 feet 85 feet ^^^^■^^^ F7?e DELAWARE RIVER BRIDGE PHI LADELPHI A— CAMDEN Length of Main Structure . Height of Towers above Wa Depth of Piers below Water Main Span 1 595 feet 3470 feet 375 feet S5 feet Sa^r^j^^g^fcr, BROOKLYN BRIDGE NEW YORK CITY, N. Y. The Golden Gate Bridge longestspan bridge in the world Please mention The International Photographer when corresponding with advertisers.