Edison Diamond Disc Player

The Edison Diamond Disc player was a type of gramophone made by Thomas A. Edison, Inc. designed to play Edison Diamond Disc records. They were named 'Diamond Discs' because the matching Edison Diamond Disc player was fitted with a permanent conical diamond stylus for playing them. Diamond Discs were incompatible with lateral-groove disc record players, e.g. the Victor Victrola, the disposable steel needles of which would damage them while extracting hardly any sound. Uniquely, they are just under ​1⁄4 in (6.0 mm; 0.235 in) thick. Diamond Discs were released on the Edison Record label from 1912 to 1929.