Sorry, thought it was cool because it saves alot of time on my part. The brushes transmit power through a commutator ring. If you need power through a moving object then this is the way to do it. The rotating machinery uses a set of U shaped slip rings, and the brushes make contact inside that U transmitting power or whatever, through that contact. Rings and brushes in last picture. I'll take pics of the old set-up, so you can get an idea.
