Signedon receiver case: Tele Recr C. ADER
Inscribedon receiver case: Tele Recr C. ADER
FunctionConversion of electrical signals into sound for output
ProvenanceJefferson Laboratory, Physics Department, Harvard University
Published ReferencesThis instrument is described in:
Thomas G. Hedberg, "Catalogue: Telephones, Phonographs and Related Instruments in The Collection of Historical Scientific Instruments at Harvard University." William Andrewes, Project Director (unpublished manuscript, President and Fellows of Harvard College and Thomas G. Hedberg, 1989. Fifth Draft), pp. 64-66.
See also:
William Henry Preece and Julius Maier, The Telephone (London: Whittaker & Co., 1889), pp.50-51.