Collection of United States patents granted to Thomas A. Edison, 1869-1884
A bound set of United States patent specifications issued to Thomas Edison between 1869 and 1884, printed by the Patent Office in Washington with lithographic plates by Norris Peters, and kept as a working reference copy by Edison associate William J. Hammer. The plates are line drawings of telegraph relays, electromagnets, coils, gearing and armatures in plan and elevation, keyed with letters and signed by inventor and witnesses, offering designers clean mechanical outlines, wiring paths and engraved signature blocks.
