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I found a web page that says that it was discovered by Tesla in 1890, is that true or generally acknowledged?

Isn't 1890 too early a date?

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See listing here: Index of Early Bremsstrahlung Articles

The earliest items are: patents filed by Tesla in 1891 and 1892. And papers (by others, not Tesla) in Philosophical Magazine in 1891.

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The term Bremsstrahlung is said to be coined by Arnold Sommerfeld in 1909. Cannot access this chapter but the abstract is available. It must have the original reference. https://link.springer.com/chapter/10.1007/978-3-540-70626-7_23

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    $\begingroup$ +1. The quoted paper of Sommerfeld is (1909, p. 974). Müller–Pouillets Lehrbuch (1914, pp. 956, 1080–1081) traces the concept before him to Wiechert, Stokes, J. J. Thomson, Heaviside, Abraham. (No mention of Tesla there, but 1894 work of his is mentioned at X-rays.) $\endgroup$ – Francois Ziegler Oct 23 '18 at 14:34
  • $\begingroup$ I never understood why 19th-century papers were typically long? I guess there was no pressure to publish more in those good times. $\endgroup$ – M. Farooq Oct 24 '18 at 1:08
  • $\begingroup$ Sorry, what do you mean by “typically long”? That they didn’t slice them into MPUs? $\endgroup$ – Francois Ziegler Oct 24 '18 at 1:12
  • $\begingroup$ Yes, exactly. The modern trend is to write short articles but articles from 1920-1930s are typically 20-25 pages. I am sure about mathematics but chemistry editors usually return the paper for condensing. $\endgroup$ – M. Farooq Oct 24 '18 at 1:24
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    $\begingroup$ Well, Tesla for one didn’t overpublish. Attributions to him at “shadetreephysics.com” or “school-for-champions.com” sound like a more recent cult (i.e., to answer the question, historically not influential or “generally acknowledged”). $\endgroup$ – Francois Ziegler Oct 24 '18 at 1:53

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