Motor insulated on a parallel timber base.

Insulated motor

Motor insulated on a parallel timber base.

Illustrating method of measuring insulation resistance

insulation

Illustrating method of measuring insulation resistance

Testing the insulation resistance of an armature.

insulation resistance

Testing the insulation resistance of an armature.

Testing the insulation resistance of a motor or generator from its winding to ground.

Motor

Testing the insulation resistance of a motor or generator from its winding to ground.