Unusual types of gramophone records

（重定向自Locked groove）

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	Locked groove
释义	Locked groove 原声例句连线杂志 So the record is finished, it goes around twice, makes a locked groove, and pops up, and you wheel it over here, clean it immediately. 这样唱片就完成了，它绕了两次，形成一个锁定的凹槽，然后弹出，你把它推到这里，立即清理它。英语百科 Unusual types of gramophone records （重定向自Locked groove） 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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