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| Keywords: Philadelphia Naval Shipyard docks in 1921.jpg View northwest from 350-ton crane of the Philadelphia Naval Shipyard League Island Pennsylvania USA Drydock no 2 at right below center of the photograph This timber structure was 142 m long completed by yard labour in early 1915 The slip had dive McMyler Interstate Company rotating hammerhead cranes It was the site where the USS Henderson AP-1 first ship built by the Philadelphia Naval Shipyard came down the ways on 17 June 1916 Between drydock no 2 and slip no 1 are small shipways 64 m long used for construction of sea-going minesweepers The slip ways at the upper left of the photograph were nos 2 and 3 They were of timber construction and were built in 1918 no 2 was 260 m long and no 3 213 m long U S Historic American Engineering Record U S Library of Congress Prints and Photographs http //www loc gov/pictures/collection/hh/item/pa3416 photos 359956p/ HAER PA 51-PHILA 709--8 1921-09-23 Replogle photographer U S Navy photograph from NBP-PNSY CSF-3587-12-64 HAER PA 51-PHILA 709--8 Philadelphia Naval Shipyard | ||||
