File:Ring magnet dynamo (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg
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![File:Ring magnet dynamo (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Ring_magnet_dynamo_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_III%2C_1903%29.jpg/681px-Ring_magnet_dynamo_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_III%2C_1903%29.jpg?20100505181145)
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