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Volumes

1. Vol 1 Heating Through: What Diathermy Is The one high-frequency device in this collection with an uncontested clinical place — a machine built to warm tissue from within — and how the therapeutic heater differs from the surgical cutting unit that shares its physics.
2. Vol 2 Longwave to Shortwave, Spark to Tube How the diathermy machine grew up: Nagelschmidt naming the field around 1908, the noisy spark-gap long-wave sets of the 1910s, the vacuum-tube short-wave oscillators that settled on 27.12 MHz, and the later reach into the microwaves — and why the energy came to be coupled through plates and coils rather than pressed against bare skin.
3. Vol 3 Into the Tissue: The Heat, and the Hazards That Wrote the Rules How a radio-frequency field becomes warmth inside living tissue — ionic and dielectric loss, the real analgesic and circulatory effects, and the burns, implant interactions and exposure concerns that turned diathermy into an early proving ground for medical-device safety.
4. Vol 4 The Honest Heat and Its Overreach Where diathermy's real clinical record ends and the mid-century salesmanship begins — the brief, brutal era when deep heat genuinely fought infection, the cancer and cure-all claims that outran the physics, and the safety and regulatory story that followed.
5. Vol 5 Reading the Machine: Collecting Diathermy Apparatus How to tell a 1920s spark-gap longwave set from a tube-driven shortwave cabinet, how to read the applicators and date the maker's plate, why the tungsten spark gaps outlive the machines that held them, and how to display a mains RF appliance safely.