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The most common rotational speeds for gramophone records are 33 + 1 ⁄ 3 revolutions per minute (rpm), 45 rpm, and 78 rpm. Established as the only common rotational speed prior to the 1940s, the 78 became increasingly less common throughout the 1950s and into more modern decades as the 33 and the 45 became established as the new standards for ...
Pornography (colloquially known as porn or porno) is sexual subject material such as a picture, video, text, or audio that is intended for sexual arousal. Made for consumption by adults, pornographic depictions have evolved from cave paintings , some forty millennia ago, to modern virtual reality presentations.
Sizes of records in the United States and the UK are generally measured in inches, e.g. 7-inch records, which are generally 45 rpm records. LPs were 10-inch records at first, but soon the 12-inch size became by far the most common. Generally, 78s were 10-inch, but 12-inch and 7-inch and even smaller were made—the so-called "little wonders". [82]
The earliest multi-track records, issued around 1919 by Grey Gull Records, were vertically cut 78 rpm discs known as "2-in-1" records. These had finer grooves than usual, like Edison Disc Records . By 1949, when the 45 rpm single and 33 1 ⁄ 3 rpm LP were competing formats, 7-inch 45 rpm singles had a maximum playing time of only about four ...
The LP (from long playing [2] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.
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The 45 rpm speed was chosen to allow a 5 + 1 ⁄ 2 minute playing time from the 7-inch disc. [11] The 7-inch 45 rpm record was released March 31, 1949, by RCA Victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs. [12] The first 45 rpm records were monaural, with recordings on both sides of the disc. As ...