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Spark ball oscillator used in 1894 by Jagadish Chandra Bose to generate 60 GHz microwaves
Uploaded a work by Jagadish Chandra Bose from Retrieved from [https://books.google.com/books?id=A5IgARTOq3AC Jagadish Chandra Bose "A complete apparatus for the study of electric waves" in ''The London Edinburgh and Dublin Philosophical Magazine'' Vol. 43, No. 260, January 1897, London, Taylor and Francis, p. 58, fig. 1] on Google Books with UploadWizard
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