second meeting, Ericsson showed Bushnell a model of his own design, the future Monitor, derived from his 1854 design. Bushnell got Ericsson's permission to show the model to Welles, who told Bushnell to show it to the board. Upon review of Ericsson's unusual design, the board was skeptical, concerned that such a vessel would not float, especially in rough seas, and rejected the proposal of a completely iron laden ship. President Lincoln, who had also examined the design, overruled them. Ericsson assured the board his ship would float exclaiming, "The sea shall ride over her and she shall live in it like a duck". On 15 September, after further deliberations, the board accepted Ericsson's proposal. The Ironclad Board evaluated 17 different designs, but recommended only three for procurement on 16 September, including Ericsson's Monitor design. The three ironclad ships selected differed substantially in design and degree of risk. Monitor was the most innovative design by virtue of its low freeboard, shallow-draft iron hull, and total dependence on steam power. The riskiest element of its design was its rotating gun turret, something that had not previously been tested by any navy. Ericsson's guarantee of delivery in 100 days proved to be decisive in choosing his design despite the risk involved. Design and descriptionMonitor was an unusual vessel in almost every respect and was sometimes sarcastically described by the press and other critics as "Ericsson's folly", "cheesebox on a raft"Bushnell, Ericsson, Welles, 1899, pp. 17, 41 and the "Yankee cheesebox". The most prominent feature on the vessel was a large cylindrical gun turret mounted amidships above the low-freeboard upper hull, also called the "raft". This extended well past the sides of the lower, more traditionally shaped hull. A small armored pilot house was fitted on the upper deck towards the bow, however, its position prevented Monitor from firing her guns straight forward. One of Ericsson's prime goals in designing the ship was to present the smallest possible target to enemy gunfire. The ship was long overall, had a beam of and had a maximum draft of . Monitor had a tonnage of 776 tons burthen and displaced . Her crew consisted of 49 officers and enlisted men. The ship was powered by a single-cylinder horizontal vibrating-lever steam engine, also designed by Ericsson, which drove a propeller, whose shaft was nine inches in diameter. The engine used steam generated by two horizontal fire-tube