NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Testing an electrical transformer. Transformers are used to convert electrical voltage from one level to another, usually from a higher voltage to a lower voltage. This transformer is being tested to ensure that it efficiently converts 300 kilovolts into 10 kilovolts. Photographed in 1906.
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