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Restoration73 · 27th Sep 2019, 12:45 am

78.26 rpm is for induction motors fixed speed 50Hz, and 77.92 rpm is the 60Hz speed.
According to "Hayes on Record" (EMI book) 78 was standardised by ca 1914, and this
era will have used clockwork and DC motors.

27th Sep 2019, 12:45 am	#26
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Question on Recording speeds 78.26 rpm is for induction motors fixed speed 50Hz, and 77.92 rpm is the 60Hz speed. According to "Hayes on Record" (EMI book) 78 was standardised by ca 1914, and this era will have used clockwork and DC motors.