Plan of the United States dry dock, at Philadelphia, on the new system of the sectional floating dock, basin, & railways, now constructing by contract with Mess. Dakin & Moody. [graphic] : Area available for docking in the plan 350 by 90 feet, 31, 500 square feet. Area available for docking in the U.S. dry dock at Norfolk, 210 by 60 feet, 12, 000 square feet. It will be observed that area available for docking in this dry dock is twice and a half greater than in the U.S. stone dry dock at Norfolk, enabling the former to receive a vessel covering twice and half as much space as the utmost limit of the latter. It will also be observed that the efficiency of the Norfolk dock, is limited to docking one ship of the line at a time, of about 200 feet in length, whereas the new Philadelphia dock, will be able to dock three war steamers of 350 feet in length each, and ten ships of the line all at the same time. The Norfolk dock cost $962, 459 and the cost of one on that plan capable of taking only one vessel 350 by 90 feet, estimated on the same basis would be $2, 406, 147 or about three times the contract price of the Philadelphia dock. / Miller's lith. 107 Broadway.