A method of winding disc and drum armatures. It consists in advancing
the commutator ends of the U shaped turns progressively, so that as many
commutator bars intervene between any two consecutive commutator
connections of the wire as there are leads of wire on the drum between
consecutive leads of the wire. This is carried out with due regard to
the principle that taking the letter U as the diagrammatical
representation of a turn of wire, its two members must move through
regions of the field of opposite polarity.