John Henry Poynting
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Attribution is not provided for the image, but its age implies that it's public domain. (It must have been made in 1914 or earlier.) It was scanned on an Epson Perfection 1250 at 400dpi, cleaned up (some text was showing through the back) in Photoshop, reduced to grayscale, and saved as JPG using the 'Save for Web' optimizer. (From Grendelkhan)
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Public domain
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from Oliver Heaviside: Sage in Solitude (ISBN 0-87942-238-6), p. 117.
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John PoyntingJohn Henry Poynting byl anglický fyzik. Byl profesorem fyziky na Mason Science College po dobu dvaceti let v období 1880 až 1900, a poté působil na University of Birmingham, kde setrval až do své smrti. .. pokračovat ve čtení