File:Britannica Dynamo 32.jpg
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Britannica_Dynamo_32.jpg (253 × 245 pixels, file size: 12 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:06, 17 February 2011 | ![]() | 253 × 245 (12 KB) | commons>Keith Edkins | =={{int:filedesc}}== {{Information |Description={{en|''Separate excitation'' of an electromagnet from some other source of direct current, which may be either a primary or a secondary battery or another dynamo.}} |Source=Encyclopædia Britannica, 1911 |Au |
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