![]() ![]() On the other hand, JJ Thomson did his experiments on a similar way in the same time with deflection plates. Braun had the opportunity to have a practical application for his tube as a cathode ray indicator. In fact this could be seen as the first oscilloscope. He build and used for this experiment the tube well known as the Braun tube, in this state it had no deflection plates but he used magnetically deflection by use of coils. Braun published on the 15th of 1897 in "der annalen der Physik und Chemie" his research of time dependency of alternating currents. The possibility for magnetic deflection at cathode rays was already known at that time. In my believe and as far as I can trace information about this topic, in that days much research was done on "Radiant Matter" read cathode rays, including people like Crookes, Perrin, Lenard, Braun and Thomson. "You have a good point about the Braun and Thomson's tubes. I think it is nice (for him and for us) to get his answer to my question here: Thomson has built or used the first CRT (even with integrated plates) in 1897 - not F. You find his excellent site under the category "Valves and Tubes" in our link list. We also made a link exchange (the reason he wrote to me). Since Henk Dijkstra told me about his site dealing mainly with CRT's I posed the question to him about this matter. Therefore I did write also about Thomson when I wrote "Radios von gestern" in the mid 80's - without internet. The term "Brown-Tube" is used internationally for the CRT (Cathode Ray Tube) and very seldom people know that Brown and Thomson published their findings in the same time, 1897.
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