Signedunsigned
Inscribedinscribed on central drum: D. C. 28;
on mounting plate: 12
FunctionConversion of electrical signals into sound for output
Historical AttributesDesigner George Phelps was an engineer and inventor working for Western Union, who designed and conducted demonstrations of a series of unusual-looking telephone receivers. The multiple magnetic loops of this device, designed to enhance variable current induction in the receiver's steel diaphragm, functioned as a handle and way to hang the receiver.
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 William Andrewes, Project Director (unpublished manuscript, President and Fellows of Harvard College and Thomas G. Hedberg, 1989.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. 41-42.