Landing gears constructed for super-dreadnaughts of the air, such as the Boeing B19, are tested in a tower 35 feet high built at the Cleveland Pneumatic Tool Company. Fitted to the tester on a special carriage loaded with pig lead, the landing gear is raised to a predetermined height and dropped. It is all over in two-tenths of a second, but within that time special instruments act quickly to record the performance of the gear. With this type of apparatus a test which formerly required two hours can be completed in about four minutes.