Excerpt from A System of Electrotherapeutics: Physics of Roentgen Rays; Skiagraphy; Practical Application of Roentgen Rays; Physics of Light and Cautery
This energy, delivered in the form of an electric current, except that derived from a static machine, is not in a condition... and has not the properties requisite for the production of Roentgen rays. It has to be changed, or transformed, and for this purpose sent through what are termed transformers.
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