Why the big hole in 45 RPM records?

Gnomon

The big hole was for the jukebox mechanism which allowed all the 45's to be stacked up and dropped until a particular record was on top of the stack. Feb 14 01, 11:36 AM

armis

I am aware of jukebox mechanisms that would clamp down on the record, and if it detected a small-hole in the 7" disk, it would change the RPM to 33 1/3, and the large hole would mean 45 RPM. However, if we drill down into the history of the development of the 45, we can see that it was developed as a replacement for the 10" 78 RPM disk. It was also intended to be played on a distinct 45 RPM player, and thus the large hole to discourage use on regular turntables. See http://www.enhancedaudio.com/45_restoration.htm Aug 15 08, 2:30 PM

Baloo55th

Most of the 45s in the UK had a pushout centre (some round, some triangular). 33s didn't have this. Ex-jukebox records had the pushout pushed out, and clip-in new centres could be fitted. Aug 15 08, 3:45 PM

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When was the speed of (old) gramophone records standardized at 78 rpm? I once had a record player which could be adjusted to play discs at 78, 45, 33 and 16 RPM speeds. I have never in my life seen a record which plays at 16 RPM. Does anyone know anything about these discs - Were such records ever manufactured? Why 16, 33 1/3, 45 and 78 rpm? How many grooves are there in a 33 rpm record?

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