Unusual types of gramophone records

Polish sound postcards, one example of unusual gramophone records (1950s)

An example of the 5-inch format resting on a 7-inch single for comparison.

Flexi disc program sheets such as the Interface Age

The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (33⁄₃, 45, or 78 RPM), and appearance (round black discs). However, since the commercial adoption of the gramophone record (called a phonograph record in the US, where both cylinder records and disc records were invented), a wide variety of records have also been produced that do not fall into these categories, and they have served a variety of purposes.

单词	Concentric groove
释义	Concentric groove 英语百科 Unusual types of gramophone records The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (33⁄₃, 45, or 78 RPM), and appearance (round black discs). However, since the commercial adoption of the gramophone record (called a phonograph record in the US, where both cylinder records and disc records were invented), a wide variety of records have also been produced that do not fall into these categories, and they have served a variety of purposes.
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Concentric groove

Unusual types of gramophone records