File:Prof. Elihu Thomson's constant-current transformer (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg
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![File:Prof. Elihu Thomson's constant-current transformer (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Prof._Elihu_Thomson%27s_constant-current_transformer_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_II%2C_1909%29.jpg/750px-Prof._Elihu_Thomson%27s_constant-current_transformer_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_II%2C_1909%29.jpg?20100331175457)
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