[N125001], Technical Note, Albert Bledsoe Herrick, November 16th, 1880
Expts on chemical treatment of carbons. Soak fiber in sulphuric acid; alcohol; hydrochloric acid, etc. Notes on 9 expts through fr 893. Some drawings of attaching lamps to vac pump; note on treating carbons in napthalene, etc.. with current flowing. Fr. 910 notes & descriptions pumps made for testing. Fr 911, 912 intriguing sketches of structures in lamp globe---(filament holders???), don't seem related to surrounding text.
[N125-F] Notebook Series -- Menlo Park Notebooks
https://edisondigital.rutgers.edu/document/N125001
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 37