05/31/1875 Batchelor, Charles -- Technical Notes and Drawings
(Celluloid Co; Daniell, John Frederic) Miscellaneous technologies; Telegraph; Miscellaneous electrical technologies
[NS7501]  Notebook Series -- Unbound Notes and Drawings: (NS-75-001) General
[NS7501A; TAEM 7:319]
Courtesy of Thomas Edison National Historical Park.