A direct current motor made by Daniel Davis, ca. 1848, no extant maker's markings. A horseshoe type permanent magnet has a winding on each side connected to terminal posts on the base. A brass wheel has 3 iron pieces which rotate in the field of the electromagnet poles. A spoked commutator arrangement is affixed to the wheel shaft with a brush touching the spokes. This motor was supposed to have been used by Joseph Henry. Reference: Davis, Manual of Magnetism, 1848 (Published in Boston by Daniel Davis) pages 208-210.