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Image #   97110E
Name:   Grooves in a 78 rpm phonograph record
Copyright:   Copyright 2009 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Surface recording grooves of a 78 rpm phonograph record. Early disc phonograph records (also called gramaphone records) were made of various materials including hard rubber. From 1897 onwards, earlier materials were largely replaced by a rather brittle formula of 25% shellac, a filler of a cotton compound (similar to manila paper), powdered slate, and a small amount of a wax lubricant. Vinyl (polyvinyl chloride) was used as a 78 rpm record material starting in 1940. These records had much less noise and less ability to break. A phonograph record is an analog sound storage medium consisting of a flat disc with an inscribed modulated spiral groove usually starting near the periphery and ending near the centre of the disc.
Magnification*: x17
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   03.01.09 Manmade record 78 rpm groove SEM 97110E 78 record 78rpm record 78rpm records PVC phonograph record phonograph record surface phonograph records polyvinyl chloride record groove record surface records gramophone record gramophone records record grooves 78 rpm record 78 rpm records gramaphone record gramaphone records hard rubber record hard rubber records vinyl record vinyl records analog analog record analog records analog sound analog sound storage analog storage flat disc recording media recording medium recording groove recording grooves disc recording disc recordings record recording record recordings spiral groove spiral grooves vinyl

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