78 rpm: Difference between revisions
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By 1925, the 78 rpm was becoming a standard for [[gramophone records]]. The exact speed depended on the frequency of the alternating current electricity supply. For countries with 60 Hz it was 78.2608696 rpm, the speed of a 3600 rpm synchronous motor reduced by 46:1 gearing. For countries with 50 Hz it was 77.9220779 rpm, the speed of a 3000 rpm synchronous motor reduced by 77:2 gearing. | |||
* http://taniguchi.com.ar/index.html?cont=show78rpm | * http://taniguchi.com.ar/index.html?cont=show78rpm | ||
* http://www.tango.info/?q=024800027 | * http://www.tango.info/?q=024800027 | ||
Revision as of 2011-03-24T00:02:42
By 1925, the 78 rpm was becoming a standard for gramophone records. The exact speed depended on the frequency of the alternating current electricity supply. For countries with 60 Hz it was 78.2608696 rpm, the speed of a 3600 rpm synchronous motor reduced by 46:1 gearing. For countries with 50 Hz it was 77.9220779 rpm, the speed of a 3000 rpm synchronous motor reduced by 77:2 gearing.
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