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microphone
(Encyclopedia)microphone, device for converting sound into electrical energy, used in radio broadcasting, recording, and sound amplifying systems. Its basic component is a diaphragm that responds to the pressure or...Colorado–Big Thompson project
(Encyclopedia)Colorado–Big Thompson project, constructed by the U.S. Bureau of Reclamation to divert water from the headstreams of the Colorado River to irrigate c.720,000 acres (291,400 hectares) of land in NE C...Swan, Sir Joseph Wilson
(Encyclopedia)Swan, Sir Joseph Wilson, 1828–1914, English chemist and physicist. He made an incandescent lamp using a carbon filament (1860), 20 years before Edison's lamp. Noted for important contributions to ph...Cherokee Strip
(Encyclopedia)Cherokee Strip or Cherokee Outlet, a narrow piece of land in N Oklahoma. Bounded on the north by the Kansas border, it has an area of more than 6 million acres (2.4 million hectares). Measuring some 5...García Robles, Alfonso
(Encyclopedia)García Robles, Alfonso älfônˈsō gärsēˈä rōˈblās [key], 1911–91, Mexican statesman, b. Zamora, Mex. After studying law in Europe, he entered the Mexican foreign service in 1939. He was a ...record player
(Encyclopedia)record player or phonograph, device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a phonograph record, or simply a record (see sound reco...battery, electric
(Encyclopedia) CE5 Lead storage cell: At the lead-dioxide electrode, electrons from the circuit combine with lead dioxide and sulfuric acid to form lead sulfate and water. At the spongy-lead electrode, lead react...learning disabilities
(Encyclopedia)learning disabilities, in education, any of various disorders involved in understanding or using spoken or written language, including difficulties in listening, thinking, talking, reading, writing, s...Farmer, Moses Gerrish
(Encyclopedia)Farmer, Moses Gerrish, 1820–93, American inventor, b. Boscawen, N.H. He helped build and maintain some of the pioneer telegraph lines of Massachusetts and experimented in multiple telegraphy. He exh...Lumière, Louis Jean
(Encyclopedia)Lumière, Louis Jean ōgüstˈ [key], 1862–1954, French inventors, brothers. They invented the Cinématographe, which was patented and demonstrated in 1895. This mechanism was the first to photograp...Browse by Subject
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