THE ZMC‐2 hull is 149 ft. 5 in. long from bow to stern, and 52 ft. 8 in. in maximum diameter. Its covering consists of 0•0095 in. thin Alclad alloy sheets sewn together by the Aircraft Development Corporation riveting machine. Each of the rings of sheet metal composing the hull surface has the shape of the frustum of a cone; together the cones closely approximate the curvature of the hull. There are 142 such conical surfaces from bow to stern.
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