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| | Analogue disc record (Site not responding. Last check: 2007-10-22) |
 | | An analogue disc record is a flat disc with inscribed spiral grooves, in which the playback process begins with the direct mechanical motion of a stylus riding within the groove as the disc rotates. |
 | | Recording on disc as opposed to phonograph cylinder had been contemplated and experimented with by such inventors as Charles Cros, Thomas Edison, and Chichester Bell, but the first to actually develop usable disc record technology was Emil Berliner, a German working in Washington, DC, in 1884. |
 | | All speeds of records were made in various sizes, mainly 7, 10 and 12 inches (18,20.5 and 30.5 cm aprox.) diameter; the 7-inch being most common for the 45rpm, the 10-inch for the 78 (and the first few years of 33⅓ production), and the 12-inch for the 33 from the mid 1950s on. |
| www.sciencedaily.com /encyclopedia/analogue_disc_record (3392 words) |
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