Incandescent light bulb street in the world to be lit by an incandescent lightbulb was Mosley Street, Newcastle upon Tyne, United Kingdom. It was lit by Joseph Swan's incandescent lamp on 3 February 1879. Thomas Edison began serious research into developing a practical incandescent lamp in 1878. Edison filed his first patent application for "Improvement In Electric Lights" on 14 October 1878. After many experiments, first with carbon in the early 1880s and then with platinum and other metals, in the end Edison returned to a carbon filament. The first successful test was on 22 October 1879, and lasted 13.5 hours. Edison continued
Charles Edison Electric Company to form the McGraw-Edison Electric Company. Edison was board chairman of the merged company until he retired in 1961. On January 18, 1937, President Roosevelt appointed Charles Edison as Assistant Secretary of the Navy, then as Secretary on January 2, 1940, Claude A. Swanson having died several months previously. Edison himself only kept the job until June 24, resigning to run his gubernatorial campaign. During his time in the Navy department, he advocated construction of the large s, and that one of them be built at the Philadelphia Navy Yard, which secured votes for Roosevelt in Pennsylvania and