10/22/1879 Upton, Francis Robbins [supplied or conjectured] -- Technical Notes and Drawings
Carbon, coal, glass, ceramics; Incandescent lamp; Vacuum and glass bulb
[N085]  Notebook Series -- Menlo Park Notebooks: Notebook #85 N-79-08-22 (1879)
[N085171; TAEM 35:868]
Courtesy of Thomas Edison National Historical Park.