One of the patents (No. 268.601) granted in 1927 covers a radio system designed for gunnery control and the sending of compass and master-clock indications. Another patent (No. 416.126) was, designed to eliminate "night-error"—When. in a public document, copies which are available io any one. However, Mr. Watts fifteen patents indicate that a tremendous amount of research and groundwork, extend, ing over a long period of years, went into the development of this instrument. Oddly enough, none of Mr. Watt's inventions was patented in the United States.
England, however, is not the only country whose inventors have been Ernst Gerhardt of Berlin received working on radiolocators. In 1939, a patent here (No. 2,177,061) for a Tadiolocator which sweeps the skies with short beams so that they Intersect. Where the beams cut through one another an interference pattern or radio curtain is set up. Am geroplane caught in this "curtain' in-Gicates its position by radio waves Teflected from the body of the craft to a receiving station on the ground. This patent is assigned to Germany's great radio firm, the Telefunken Gesellschaft fur Drahtlose Telegraphie. An application for a patent was filed in Germany as early as 1935.
American Develops Finder United States inventors have also been busy. Recently the War Department announ that it had developed a radiolocator and issued a call for volunteers to operate chain of them which it declared would be erected on the coastline.
Text read from the printed page and cleaned; old type leaves the occasional error.