New York: 1952. Frontispiece, 11, , 4 pp. printed rectos only; folding drawing. Illus. with one artist's rendering and one 43 x 21 inch folding schematic. 4to. Brown leather flex-folder with screw ties, titled in gilt. A very good copy. boards rubbed, a few internal creases, some offsetting and darkening at the edges. Item #44156
Marked "Confidential, Excluded from the GDS [Government Declassification Schedule], National Security Information, Unauthorized disclosure subject to criminal sanctions." Thankfully, according to Executive Order 11652, "All such information originally classified as Confidential became declassified on December 31, 1978."
Complete preliminary specification for a proposed post World War II submarine for the Brazilian Navy based on the Gato-class design, which had originally wreaked havoc on the Japanese. Listed as design 258A, the report notes "The submarine described in the following preliminary specification has been designed to include the most recent developments in submarine practice, based on the experiences gained during World War II." It had a maximum speed of 18 knots, a radius of surface operation of 5000 nautical miles, carried 12 torpedoes, and a crew of 40. Periscopes, echo sounders, sonar, radar, gyros, firing keys, torpedoes, and counter radar systems among other items would cost extra. The artist's rendering at the front includes a Brazilian flag flying from the tower, while the nearly four foot by two foot detailed schematic provides numerous cross sections at '1/8 inch to the foot' detail. Submitted to the Brazilian Navy on July 1, 1952 by the Electric Boat Company (General Dynamics ), largest maker of submarines, which had only recently announced its contract to build the Nautilus, the world's first nuclear-powered submarine. Scarce to say the least.