ClipArt ETC
"If the connections of the armature coils are reversed at the moment when the current in the coils is reversed, the induced currents will all flow in the same direction in the external circuit. There are many different ways of connecting armature coils with their commutators. The numbered loops represent the armature coils joined in series as in the ring armature." — Avery, 1895

Commutator

"If the connections of the armature coils are reversed at the moment when the current in the coils is…

End view of Delco starting motor, showing commutator and brushes.

Delco

End view of Delco starting motor, showing commutator and brushes.

The electrical symbol for a generator, commutator, and brushes.

Generator

The electrical symbol for a generator, commutator, and brushes.