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Magneto-electric therapy apparatus, hand-cranked, probably infringeing Davis's USA patent of 1854

Magneto-electric therapy apparatus

1860-1900
Late 19th century upright Davis magneto-electric therapy apparatus, hand-cranked

Late 19th century upright Davis magneto-electric therapy apparatus

Electrotherapeutic machine, by A. Berio-Caffarel, Paris, 1890-1930

Electrotherapeutic machine

1890-1930
Davis' later C19 magneto-electric therapy apparatus, hand-cranked, by Negretti and Zambra of London, Holborn Viaduct, W1

Davis' later C19 magneto-electric therapy apparatus

1865-1900
'Ultratherm' electrotherapeutic machine, probably for short-wave diathermy, with four groups of two electrodes, by General Radiological, British, 1946. Sheet metal cabinet on casters with pyramid-shaped lid, with electrode rod attachments on one side of cabinet.

'Ultratherm' electrotherapeutic machine

1946
High frequency resonator

High frequency resonator

1900-1920