Two receivers used by Jansky.
Papers of Karl G. Jansky
Jansky, David. “My Father and His Work.” Serendipitous Discoveries in Radio Astronomy. (NRAO, ed. Kellermann & Sheets, 1983) p. 4-21.
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Historical Negative #
Papers of Karl G. Jansky, “Bell Labs,” NRAO/AUI Archives, accessed June 9, 2023, https://www.nrao.edu/archives/items/show/28464.