1882 PATENT for ELECTRICITY DYNAMO Poster

From 1882, inventor Edison's large scale electricity generator. From Edison's own words: The object I have in view is to produce a dynamo or magneto electric machine the armature of which will be in the form of a disc, which armature will be stiff and strong, will not heat in its core in use, will permit the bringing of the polar extensions of the magnet or magnets close together, so as to form an intense magnetic field, and in which machine the inductive bars of the armature will be connected to generate a continuous current in one direction of high electro-motive force, and will further be connected with the commutator bars and with each other in multiple arc in order to reduce to the minimum the internal resistance of the machine.