Diagram of "Une Remarguable Experience de Transmission Phonographique et Telephonique entre New York et Philadelphie" demonstrated by Hammer in his lecture on "Edison et ses Inventions" at the Franklin Institute
name: label: Collection Creator
content: Hammer, William J. (William Joseph), 1858-1934 (electrical engineer)
setName: label: See more items in
content: William J. Hammer Collection
label: See more items in
content: William J. Hammer Collection / Series 1: William J. Hammer Papers / 1.5: Secondary Writings About Hammer
unitdate: label: Date
content: Feb. 4, 1889
container: label: Container
content: Box 19, Folder 2
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials