File:Kennedy's high-pressure homopolar dynamo (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg
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![File:Kennedy's high-pressure homopolar dynamo (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Kennedy%27s_high-pressure_homopolar_dynamo_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_III%2C_1903%29.jpg/800px-Kennedy%27s_high-pressure_homopolar_dynamo_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_III%2C_1903%29.jpg?20100701150246)
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