By Chen-Pang Yeang
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Additional info for Probing the Sky with Radio Waves: From Wireless Technology to the Development of Atmospheric Science
Panel D: the transmitter’s antenna rotates from 0° to 360°; Panel B: the receiver’s antenna rotates from 0° to 360°. Marconi, “On methods” (1906), figures 2 and 4. direction was 0° from the aerial direction of the transmitter or receiver antenna. Typically, the intensity was minimal when the directional angle was about 110° or 250°. 37 In the same year, Braun also published his discovery on directed 37. Marconi, “On methods” (1906), 413–21. 38 In 1906, a year after leaving Strasbourg, Zenneck obtained a professorship in physics at the Braunschweig Technical University.
The solution should be general enough so that the same procedure, with slightly modified numerical coefficients, boundary or initial conditions, or analytical approximations, could solve other physical problems. 8 If Duhem’s view reflected his contemporaries’ collective mentality, it’s no wonder that the new mathematical physics tended to offer formal expressions of facts rather than explaining them and to focus on empirical phenomena that they could reduce to mathematical representations. Transoceanic propagation of radio waves became one such theoretical problem just after 1900.
Zenneck’s theoretical work resulted in a 1907 article in Annalen der Physik. 5). The novelty of his approach lay not only in the geometry, however; he did not use 39. Zenneck, Erinnerungen (1961), 162 (my translation). I thank the library of the Max Planck Institute for the History of Science in Berlin for providing me with a photocopy of relevant pages of the book. Theorizing Transatlantic Wireless with Surface Diffraction 43 any information about the dipole oscillator to explain the overall field that the source generated and that the boundary condition shaped.
Probing the Sky with Radio Waves: From Wireless Technology to the Development of Atmospheric Science by Chen-Pang Yeang