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RADIOSTAT MEDICAL COIL, 1930's
Medical coil with glass electrodes.
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Seen as an early 'Tens' machine.
This would be plugged into the mains, using Alternating or Direct Current.
Direct Currant was available up until the late 30's. and beyond.
A vibrator coil, similar to a door bell, drives a larger coil in the probe unit, producing a high voltage, which was applied via evacuated or gas filled glass tools. See Crookes tubes in the scientific section.
Used for treating skin complaints such as eczema.
Also see similar item A1268.
WARNING These units are connected directly to the mains and are dangerous.