1882 Hammer, William Joseph -- Technical Notes and Drawings
Sockets, fuses, meters, and other interior elements
[X098E]  Smithsonian Institution, Washington, D. C. -- National Museum of American History Archives Center: William J. Hammer Collection -- Notes and Drawings (1879-1887)
[X098E19; TAEM 0:0]
Courtesy of the NMAH Archives Center.