33, 45 and 78 RPM gramophone records
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Gramophone Records:

A gramophone record is an analog sound recording medium consisting of a flat disc with an inscribed, spiral groove.

Developed in the U.S. by: Emile Berliner
Launched:  1889
Used for: home and professional audio recording
a.k.a.: phonograph record, vinyl record, record, LP, single, EP

Common formats:

Diameter

R.P.M.

Duration

12 in (30 cm)

331⁄3

45 min (LP)

45

Maxi Single

10 in (25 cm)

331⁄3

Long play (LP)

78

3 minutes

7 in (17.5 cm)

45

Single

331⁄3

EP

Materials: vinyl (polyvinyl chloride), Shellac , aluminum, rubber, fiber.

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