Tesla's Own Electrotherapy: The 1898 Paper

After two cautionary tales — Benveniste and Montagnier — the lineage comes home to documented ground, and to the name on the door. In the late 1890s, Nikola Tesla was the most famous electrical engineer alive, and high-frequency current was his signature instrument. So it is fitting that one of the era's most-cited demonstrations of electricity meeting the body came from Tesla himself — a real address, in a real hall, in 1898, that we can read to this day.

Buffalo, September 1898

On the 13th to 15th of September 1898, at the eighth annual meeting of the American Electro-Therapeutic Association in Buffalo, New York, Tesla presented an address titled "High Frequency Oscillators for Electro-Therapeutic and Other Purposes." It was published in the period electrical press — notably The Electrical Engineer of November 17, 1898 — and circulated in the association's proceedings. A century later, the Proceedings of the IEEE reprinted it,^[1] a recognition that the talk is a genuine historical document of electrical engineering, not a footnote.

The heart of the talk is engineering, not medicine. Tesla described his high-frequency, high-voltage oscillators — the resonant transformer circuits now associated with his name — and the striking physiological behavior of the currents they produced. His central, repeatedly quoted observation was the apparent harmlessness of high-frequency current: it was possible to pass a remarkable amount of electrical energy through a person without the pain or danger that ordinary low-frequency current would cause. He and his audience were fascinated that such currents produced warmth and gentle sensation rather than the violent shock of mains-frequency electricity.

The physics underneath

Part of what Tesla was observing relates to what we now call the skin effect — the tendency of alternating current, at very high frequency, to flow along the outer surface of a conductor rather than through its core — together with the body's frequency-dependent electrical response. The practical, well-established consequence is that very-high-frequency current behaves very differently in living tissue than the low-frequency current that causes electrocution. Tesla leaned into the spectacle: the body lit up in a field of current, the smell of generated ozone, a showman's wonder at the physiological reach of his apparatus.

It is worth being precise about what he demonstrated versus what he hoped. What Tesla genuinely showed was sound — an engineer's command of high-frequency, high-voltage generation, and the real, reproducible phenomenon that such currents warm tissue and are tolerated entirely unlike ordinary current. What he and his contemporaries speculated — that this warming and stimulation might heal a broad catalog of ailments — was the optimistic spirit of the age, not a proven medical program. Tesla was a brilliant guide to the physics; the medicine of the moment ran far ahead of its evidence.

Tesla gave the era something true to build on — that high-frequency current and the body have real, repeatable business with one another. What the era then claimed it could cure was a separate, far shakier matter. — on the 1898 Buffalo address

The real lineage: d'Arsonval and diathermy

Tesla was not alone in this current. In France, the physiologist Jacques-Arsène d'Arsonval was the parallel pioneer of high-frequency currents in medicine. Beginning around 1890–91, d'Arsonval showed systematically that currents above roughly ten kilohertz no longer produced the shock reaction of low-frequency electricity but instead produced warming — the very same observation Tesla dramatized in Buffalo. He built resonant high-frequency apparatus and clinical applications that became known as "d'Arsonvalization."^[2]

That line did not vanish with the era's fads. The controlled, deep heating of tissue by high-frequency electromagnetic energy matured into diathermy — a term that displaced "d'Arsonvalization" after about 1920.^[3] Diathermy, including shortwave diathermy, is today an accepted, regulated physical-therapy technology: physical therapists use it to raise tissue temperature for increased local blood flow, reduced muscle spasm, and improved tissue extensibility. This is the honest, unbroken through-line from Tesla's and d'Arsonval's benches to a modern clinic — a real descendant, not a marketing claim.

1. Step 1 · The instrumentHigh-frequency oscillatorsTesla's resonant transformers generate high-voltage, high-frequency current — the engineering he commanded better than anyone alive.^[1]
2. Step 2 · The observationHarmless warmth, not shockHigh-frequency current passes through the body producing warmth and sensation, not the violent shock of mains current — relating to the skin effect.
3. Step 3 · The paralleld'Arsonval, the same effectIn France, d'Arsonval shows currents above ~10 kHz warm rather than shock — independent confirmation of the core phenomenon.^[2]
4. Step 4 · The descendantDiathermy, made clinicalControlled deep heating by high-frequency EM becomes diathermy — accepted, regulated physical-therapy technology.^[3]
5. Step 5 · The modern lineStudied on its own evidenceToday's photobiomodulation and PEMF are evaluated by their own mechanisms and trials — ancestry is not efficacy.^[4]

Why this story belongs here — and where the line is

This is the namesake's own place in the lineage, and we get to be proud of it precisely because we can tell it honestly. Tesla genuinely stood in a field of high-frequency current in 1898 and asked what electricity and the body have to do with each other — a real question, pursued by real engineering, that fed a real clinical descendant in diathermy. That is an ancestry worth claiming.

But ancestry is exactly where careless brands overreach, so here is the bright line, drawn on our own name: history earns interest; it does not confer efficacy. Tesla's 1898 talk does not prove anything about a modern device — not a competitor's, and not the S.E.A.D. System. We make no medical claims, and we do not borrow Tesla's authority to imply we are validated by his work. What we take from Buffalo in 1898 is the image, not the invoice: a master engineer, hands in the current, asking the question this whole Journal has been chasing — pursued ever since with far better tools and far more humility. The fuller map lives in the Biofield Research Hub, and the modern S.E.A.D. lineage in the lineage page.

Quick answers

Bioelectric Pioneers series · Burr · Becker · Nordenström · Szent-Györgyi · Benveniste · Montagnier · Tesla 1898 · Biofield Hub →

Tomorrow on the Journal

Day 45 — Fritz-Albert Popp and the Biophoton Question. The German biophysicist who measured the faint, ultraweak light that living cells emit — what is solidly established about biophotons, what remains his bolder hypothesis of coherence, and the honest line between, told as the lineage continues.