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Bell's harmonic telegraph receiver, 1925-1958

1925-1958

Replica of Bell's 1875 tuned reed telephone receiver, 1925-1958

1925-1958

Replica of Bell's 1875 harmonic telegraph transmitter, 1925-1958

1925-1958
Dr. H.Mummery's D.Sc. hood, by Cotrell-Leonard, Albany, New York, 1915

Dr. H. Mummery's D.Sc. Hood.

1915
Electromagnet with 450 turns, Henry, 1828, (replica)

Joseph Henry's electromagnet, 1888, reconstruction

1888