Professional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials. Of his many inventions and developments, the most important are: 1) the regenerative or feedback circuit, 1912, the first amplified radio reception, 2) the superheterodyne circuit, 1918, the basis of modern radio and radar, 3) superregeneration, 1922, a very simple, high-power receiver now used in emergency mobile service, and 4) frequency modulation - FM, 1933, static-free radio reception of high fidelity
Dates:
1886/1982 [Bulk Dates: 1912/1954]
Repository/Collector:
Rare Book and Manuscript Collections, Butler Library
Repository/Collector Type:
College or university
City:
New York
State:
New York
Country:
United States
Extent:
295.7 linear ft ( 573 boxes, 30 flat folders, 10 phono discs, & 5 tape reels).
Access statement:
The following boxes are located off-site: 2-573. You will need to request this material from the Rare Book and Manuscript Library at least two business days in advance to use the collection in the Rare Book and Manuscript Library reading room.