D'Arsonval cage for electrotherapeutic auto-conduction, octagonal wooden frame, by Richard Heller of Paris, 1890-1910, used by Dr J.-A. Riviere. Patient was insulated from all contact with current carrying wire, and since the wire was carrying high-frequency alternating current, the patient didn't feel a thing, except a slightly warm sensation. Also includes hand-held coil with light bulb socket for demonstration purposes; when the cage was electrified and the coil was held in the hands of the person inside, the bulb would light up.

Electrotherapeutic machine/solenoid or cage for auto conduction, octagonal wooden frame, by Richard Heller of Paris. The user is insulated from all contact with current carrying wire.