This set was made in about 1928. It uses a fan motor and a 24 hole
disk. The 3 tube amplifier is made by Daven. Because the motor is not
synchronous and there are no phonic coils, the picture had to be
continually adjusted to keep it still. The set was purchased in
Nashville years ago and moved to London, Ontario. (Thanks to Luc
Sirois for the pictures and the information).
Set using Jenkins disk. Note the motor drive
arrangement. Speed of the disk is changed by moving the motor and
its drive wheel in and out.