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Über die Gültigkeit des Draperschen Gesetzes (pp.77-90). + Notiz zu meinem Aufsatze: "Über die Gültigkeit des Draperschen Gesetzes" + Die Gesetze der schwarzen Strahlung und ihre praktische Verwendung.
Arch. Mathematik und Physik, III. Reihe. - Leipzig, 1901/04, 8, pp.155-170, 261-281, 227-234, 5 Abb., 3 Tab., 2 OBrosch. Lummer and Pringsheim subsequently confirmed Planck's radiation formula with great precision! "In 1898, after relimary work concerning, among other thins, the production of the blackbody, Lummer tackled the problem of determining the Kirchhoff function depending only on wavelength and temperature - that is, he was seeking the emissive power of the blackbody. With Pringsheim he confirmed Wien's desplacement law and also, which Wien had stated in 1896 and Paschen had experimentally ascertained. In 1900, however with Pringsheim discovered the "nonvalidity" of this law, which the called the Wien-Planck equation: It "is therby demonstrated that the Wien-Planck spectral equation does not yield the blackbody radiation that we measured in the region of 12 to 18. The competing team of Rubens and Kurlbaum verified this important result and derived from their measurements a conclusion that went even further: "The intensity of a monochromatic beam at high temperatures is proportional to the temperature." This was the decisive stimmulus leading to Planck's radiotion formula, which he communicated on 19 October 1900. Lummer and Pringsheim subsequently confirmed this law with great precision, therby establishing an unassailbable foundation for the emergin quantum theory." Armin, Hermann, DSB VIII, p.551f.
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