[michaelsbradley]

Homopolar motor, maybe?

[8bitsrule]

I was just going to say: all 33-1/3 rpm records - regardless of their thickness or chemistry - are observed to rotate at about the same rate, regardless of record size.

And (I'll note that) the drive belts are usually hidden from view.

[michaelsbradley]

Interesting...

http://www.ptep-online.com/2018/PP-53-01.PDF