[78-L] The difference between 78 and 33 RPM records

[Steven C. Barr]

----- Original Message ----- 
From: "David Lennick" <dlennick at sympatico.ca>
> The stylus would probably be driven whether it had a groove or not, no?
> 
Once again...that depends! Edison machines (both cylinder and disc)
used a "feedscrew" to move the tone arm/reproducer along the record.
OTOH, virtually ALL disc players depended on the groove's spiral
path to move the reproducer inwards! The latter had become the
standard approach by the time microgroove phonorecords started
to appear...?!

Steven C. Barr