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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.
The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (33 1 ⁄ 3, 45, or 78 RPM), and appearance (round black discs).
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]
A twelve-inch Capitol Records gramophone record. The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.
The label usually noted whether the disc was "outside start" or "inside start". If there was no such notation, an outside start was assumed. Beginning in the mid-1950s, some transcription discs started employing the "microgroove" groove dimensions used by the 12- and 10-inch 33 + 1 ⁄ 3 rpm vinyl LP records introduced for home use in 1948 ...
As vinyl records, the most common format for the double EP, they consist of a pair of 7-inch discs recorded at 45 or 33 1 ⁄ 3 rpm, or two 12-inch discs recorded at 45 rpm. The format is useful when an album's worth of material is being pressed by a small plant geared for the production of singles rather than albums and may have novelty value ...
Besides being dark and mysterious, crows are extremely intelligent birds. So smart, in fact, that it might be a little bit scary. Even though their brains are the size of a human thumb, their ...
Larger size Victor blanks were introduced late in 1931, when RCA-Victor introduced the Radiola-Electrola RE-57. These machines were capable of recording at 33 1 ⁄ 3 rpm as well as 78 rpm. One could select to record something from the radio or one could record using the hand-held microphone.