Phonograph record
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A phonograph record, a vinyl record, or simply a record or vinyl is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts near the outside edge and ends near the center of the disc. The stored sound information is made audible by playing the record on a phonograph.
Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single
Conductor and cast members of the D'Oyly Carte Opera Company with acoustic recording horn at HMV, c. 1924
Emile Berliner with disc record gramophone
Hungarian Pathé record, 90 to 100 rpm
Spiral
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In mathematics, a spiral is a curve which emanates from a point, moving farther away as it revolves around the point. It is a subtype of whorled patterns, a broad group that also includes concentric objects.
Cutaway of a nautilus shell showing the chambers arranged in an approximately logarithmic spiral
An artist's rendering of a spiral galaxy.
Sunflower head displaying florets in spirals of 34 and 55 around the outside.
Cucuteni Culture spirals on a bowl on stand, a vessel on stand, and an amphora, 4300-4000 BCE, ceramic, Palace of Culture, Iași, Romania