Army and Navy to tell each other what they were doing." He established a cordial relationship with Secretary of War Henry L. Stimson, and Stimson's assistant, Harvey H. Bundy, who found Bush "impatient" and "vain", but said he was "one of the most important, able men I ever knew". Bush's relationship with the navy was more turbulent. Bowen, the director of the Naval Research Laboratory (NRL), saw the NDRC as a bureaucratic rival, and recommended abolishing it. A series of bureaucratic battles ended with the NRL placed under the Bureau of Ships, and Secretary of the Navy Frank Knox placing an unsatisfactory fitness report in Bowen's personnel file. After the war, Bowen would again try to create a rival to the NDRC inside the navy. On August 31, 1940, Bush met with Henry Tizard, and arranged a series of meetings between the NDRC and the Tizard Mission, a British scientific delegation. At a meeting On September 19, 1940, the Americans described Loomis and Compton's microwave research. They had an experimental 10 cm wavelength short wave radar, but admitted that it did not have enough power and that they were at a dead end. Taffy Bowen and John Cockcroft of the Tizard Mission then produced a cavity magnetron, a device more advanced than anything the Americans had seen, with a power output of around 10 kW at 10 cm, enough to spot the periscope of a surfaced submarine at night from an aircraft. To exploit the invention, Bush decided to create a special laboratory. The NDRC allocated the new laboratory a budget of $455,000 for its first year. Loomis suggested that the lab should be run by the Carnegie Institution, but Bush convinced him that it would best be run by MIT. The Radiation Laboratory, as it came to be known, tested its airborne radar from an Army B-18 on March 27, 1941. By mid-1941, it had developed SCR-584 radar, a mobile radar fire control system for antiaircraft guns. In September 1940, Norbert Wiener approached Bush with a proposal to build a digital computer. Bush declined to provide NDRC funding for it on the grounds that he did not believe that it could be completed before the end of the war. The supporters of digital computers were disappointed at the decision, which they attributed to a preference for outmoded analog technology. In June 1943, the Army provided $500,000 to build the