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The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com Tesla "Pancake Coils": Redefining Tesla Technologies |
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| A. S. Aloe "Lightning" Electrotherapeutic Cabinet | |
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Frank S. Betz 1910 High Frequency X-Ray Coil and
Portable High Frequency Coil |
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| Discharge from Frank S. Betz Pancake Coil | |
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| Frank S. Betz BetzCo Portable High Frequency Coil | |
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| Thompson Plaster Electrotherapeutic Cabinet | |
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H. G. Fischer Type M "Violet Rays" |
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McIntosh Violet Rays |
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Scheidel-Western "Columbia" Violet Ray |
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 Wappler "Hyfrex" High Frequency Coil |
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