02/02/1877 [Supplied year, month, and day] Edison, Thomas Alva -- Technical Notes and Drawings
(Phelps, George May; Bunnell, Jesse H) Electromotograph; Arc lighting; Miscellaneous electrical technologies
[NV08]  Notebook Series -- Unbound Notebooks: Vol. 8 (1876-1877)
[NV08233a; TAEM 3:658]
Courtesy of Thomas Edison National Historical Park.