Kept “under wraps” during many months of secret development, the |world’s mightiest bombing plane has been built in the Dpuglas aircraft plant at Santa - Monica, Calif, for the U. S. Army. Weighing seventy tons loaded - more than twice the size of the army’s thirty-ton “flying fortresses” - this superbomber with its 6,000 mile range should be able to fly to Europe and back with a twenty-eight-ton load of bombs. Even as the big plane was prepared for test flights, many of its details were kept secret, and visitors have been barred for more than a year from the section of the factory where its construction was progressing. But it had to be moved oudoors to have its wings attached, and some of its dimensions were made public. Its wing spread is 210 feet, its four engines develop 6,000 horsepower, and although it is half again as large as the famous old Germart 112-passenger “DO-X,” it is built to carry a war crew of ten men. The heated and ventilated sleeping quarters, radio room and navigator’s compartment have been soundproofed. The three-blade propellers, sixteen feet in diameter, are of the constant-speed type. As to its speed, the war department only stated that it would be “more than 200 miles an hour.” In general outline the million-dollar B-19 resembles the big overland sky liners used by the commercial air lines, which, however, it dwarfs by comparison. Its retractable landing gear is of the tricycle type.