Signedsigned: Couch TRADEMARK
Inscribedon back: SOLID PAT'D AUG. 14. 1900;
each of 2 magnets: SOLID PAT'D
FunctionConversion of electrical impulses to sound for output by telephone
Historical AttributesUsed at Boston City Hospital.
ProvenancePrivate Donor, Cambridge, MA.
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 William Andrewes, Project Director (unpublished manuscript, President and Fellows of Harvard College and Thomas G. Hedberg, 1989.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), p. 93.