Record players for vinyl, etc

  the hick 08:20 03 May 08
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Record players operated at speeds of 33.34, 45 and in the spring-drive wind-up era, 78 revs. per minute. Also, I think language records were 16.67 rpm. Does anyone know how these speeds were arrived at, and if there is an arithmetical link among them all, although 33.34 is twice 16.67. Someone must know here!

  John B 08:29 03 May 08
  Quickbeam 09:07 03 May 08

but a fascinating answer...

  the hick 10:42 03 May 08

Thank you for the reply, there I was thinking there must be perhaps some scientific explanation with theory behind it! On a different point, some years ago I did here from a chum who had visited Abbey Rd studios, they still had an early weight-driven recording lathe - a falling weight with a governor, which ensures constant speed, as early electric motors were difficult to control. It took around 4 minutes to reach the floor, which is maybe another reason why many popular recordings were less than 4 mins long.

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