Coronet major lathe

I have a coronet major wood lathe and want to fit a rheostat so I can slow the speed down.
Can anyone recommend one or will they not work ?
Tim

Our lathe is coronet no. 1 and has a 240volt, single phase, capacitor start motor. the speed cannot be controlled due to the capacitor. As the motor slows down, the centrifugal capacitor controller will close discharging the capacitor and speed the motor up. At least that is what we figured out.

Thanks for that.
Tim