Rotolite D 2900 Variable Speed Mirror Ball Rotator

A vintage piece!  This is a Rotolite D 2900 variable speed rotator.  It is used mostly for mirror balls and other non-powered objects to be rotated.  I am planning on using this for the "Atomic" or "Dradle" mirrored units.  The rotator has a standard 12 volt DC motor that responds from a 0 - 10 volt DC signal from the controller.  Unit made in the US.