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No. 4. D. D. Home Electrical Apparatus

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This medical device supplied ‘Galvanic’ (direct) current from a dry-cell battery. It was a low-end product for use in the home. The purchaser received 90-page booklet with instructions for treating one hundred diseases.

The large number of surviving examples suggests that this item was quite popular among self-treating patients at this time.

c. 1890