National Museum of American History (U.S.). Division of Electricity and Modern Physics Search this
11.3 Cubic feet
Scope and Contents note:
Miscellaneous information on the history of telephonic and wireless communication; considerable personal correspondence about men and events in the field, especially disputed claims of inventions, development, and the like.
The collection is divided into 4 series.
Series 1: Subject files, 1907-1964
Series 2: Papers and talks by Espenschied, 1923-1969
Series 3: Patents, 1928-1953
Series 4: Correspondence, 1947-1959
Espenschied was born in St. Louis and graduated from Pratt Institute in electrical engineering, 1909; on staff of the Telefunken Wireless Telegraph Company, 1909-10; worked for American Telephone and Telegraph Company in various capacities, 1910-34; directed high-frequency transmission development for Bell Telephone Laboratories, 1934-37. Chief interests seem to have been wide-band and carrier waves and wide band systems for communications.
Immediate source of acquisition unknown.
Collection is open for research.
Collection items available for reproduction, but the Archives Center makes no guarantees concerning copyright restrictions. Other intellectual property rights may apply. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Originally published September 1943 by Telefunken Wireless Telegraph Company.
Translated by OP 20 GL-A, 1944-11-08.
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Captured German Technical Documents (Technical Intelligence Center Film), Acc. XXXX.0409, National Air and Space Museum, Smithsonian Institution.