Search results
Results from the WOW.Com Content Network
Throughout the 20th century, Edison was the world's most prolific inventor. At the beginning of the century, he held 736 U.S. patents. His final count was 1,093 U.S. patents, including 1084 utility patents (patents for inventions) and 9 artistic design patents. It was not until June 17, 2003 that he was passed by Japanese inventor Shunpei ...
Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman. [ 1 ] [ 2 ] [ 3 ] He developed many devices in fields such as electric power generation , mass communication , sound recording , and motion pictures. [ 4 ]
Thomas Alva Edison invents the fuse: 1893: During the Fourth International Conference of Electricians in Chicago, electrical units were defined 1893: English physicist J. J. Thomson invented waveguides. 1894: Italian inventor Guglielmo Marconi begins developing the first radio wave based wireless telegraphy communication system [6] [7] 1895
The war of the currents was a series of events surrounding the introduction of competing electric power transmission systems in the late 1880s and early 1890s. It grew out of two lighting systems developed in the late 1870s and early 1880s: arc lamp street lighting running on high-voltage alternating current (AC), and large-scale low-voltage direct current (DC) indoor incandescent lighting ...
Invention: Thomas Edison invents the first dictation machine, a slightly improved version of his phonograph. [2] 1936: Invention: A team of engineers at Bell Labs, led by Homer Dudley, begins work on the Voder, the first electronic speech synthesizer. [3] 1939: March 21: Invention: Dudley is granted a patent for the Voder, US patent 2151091 A ...
Ever since Thomas Edison invented the phonograph in 1877, it produced distorted sound because of gravity's pressure on the playing stylus. In response, Emile Berliner invented a new medium for recording and listening to sound in 1887 in the form of a horizontal disc, originally known as the "platter".
Getty By Jacquelyn Smith The job interview was born in 1921, when Thomas Edison created a written test to evaluate job candidates' knowledge. Since then, the process has come a long way. "As the ...
His invention of the voltaic cell leads to the invention the electric battery. 1791 – Luigi Galvani discovers galvanic electricity and bioelectricity through experiments following an observation that touching exposed muscles in frogs' legs with a scalpel which had been close to a static electrical machine caused them to jump. He called this ...