with good seakeeping abilities and, yet, able to carry a heavy battery. Yorktown was authorized in the 1886 fiscal year, and the contract for her construction was awarded to the William Cramp & Sons shipyard of Philadelphia. The hull for Yorktown was designed by the Navy's Bureau of Construction and Repair while the mechanical design was left to the Cramp yard. Yorktowns keel was laid on 14 May 1887. The ship was launched on 28 April 1888 and sponsored by Mary Cameron, the daughter of U.S. Senator Don Cameron of Pennsylvania. The dynamite-gun cruiser was launched a few minutes after Yorktown in the same ceremony. According to a news account, 25 United States Senators, 180 Congressmen, the Secretary of the Navy William Collins Whitney, and the governors of six states attended the dual ceremony, many arriving from Washington, D.C., via the Baltimore and Ohio Railroad's passenger steamer . By 19 March 1889, Cramp had completed Yorktown and was prepared to turn her over to the Navy. Layout As built, Yorktown was in length and abeam. Her steel hull had an average draft of , which was expected to give her the ability to escape from larger ships into shallow water. At the waterline was a turtleback deck of ⅜-inch (9.5 mm) steel that formed a watertight seal over the lower spaces. The deck had a crown at the level of the waterline and curved downwards to below the waterline at the sides of the ship. Below this armored deck were twelve compartments separated by watertight bulkheads; the spaces above were equipped with watertight doors intended to be closed during battle. Above the armored deck, Yorktown had forecastle and poop decks with an open gun deck that spanned the length of the ship between them. The conning tower was located forward on the forecastle deck and was oval-shaped to deflect shot. It was outfitted with a steam-powered steering wheel, a telegraph, and speaking tubes; it was protected by of steel armor plate. Propulsion Yorktown was powered by two triple-expansion steam engines which each drove one of the pair of , three-bladed screw propellers. The cylinders of each engine were 22, 31, and 51 inches (56, 79, and 130 cm) in diameter and had a stroke. Each engine was rated at and together were designed to move the ship at , though the ship exceeded that in her trials. The engines, situated