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Volumes

1. Vol 1 The Shock That Stopped Hurting How Jacques-Arsène d'Arsonval, Paul Oudin, Nikola Tesla, and Frederick Finch Strong turned a physiological curiosity — that fast enough electricity ceases to convulse the body — into a whole branch of medicine, and the glass electrode that would later be sold as the 'violet ray.'
2. Vol 2 How It Is Generated and What It Does to Tissue The spark-gap, condenser, and resonant coil that made high-frequency current — and the single honest discovery inside all the marketing: that such current heats tissue deeply without the violent muscle contraction of ordinary shock.
3. Vol 3 d'Arsonvalization in the Clinic How the hospital high-frequency apparatus was actually used on patients — the autoconduction solenoid cage and the autocondensation couch, the resonator coil and spark gap behind them, and the question of how the method got d'Arsonval's name.
4. Vol 4 The Hinge to Quackery How the identical high-frequency coil a hospital called a d'Arsonval apparatus became the drugstore 'violet ray' wand, sold for baldness, deafness, and nearly everything else — the sober engineering account of which the Violet Ray Wands dive is the retail version.
5. Vol 5 Collecting the High-Frequency Apparatus How to identify and date a hospital d'Arsonval or Oudin unit, its resonator coil, spark gap, autoconduction cage, and set of glass electrodes — and why the only sound way to keep a surviving high-voltage antique is to display it cold.