Purpose: To demonstrate the basic principles of motors and generators, and to show that the same device can serve as a motor and as a                      generator.

Generator. With crank shaft attached to the motor/generator armature and the leads attached to the galvanometer, turn the crank at various speeds in both directions and note the current.

Motor. Slide the armature housing so as to disengage the crank shaft. Connect the leads to the battery and note that the armature turns. (If the plane of the armature is perpendicular to the magnetic field, or nearly so, the motor will not start turning.)

References:

Manual: Online