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I knew I was going to miss something when it came to talking about records because of how much background there is, but thanks for the info.A pedant writes: 12 inch microgroove albums are rotated at 33.333 recurring rotations per minute, due to the ready availability of 3,600 rpm motors, geared at a ratio of 108:0
This meant initial 12" records with 76 µm groove could contain 11 minutes of music, equivalent to a 1,000 foot run of 35mm film at 24 frames per second
16 inch discs containing 15 minutes of music were also produced.
Columbia and RCA-Victor developed 25 µm groove LP records simultaneously.
I knew I was going to miss something when it came to talking about records