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This is J.J. Thomson, from Oliver Heaviside: Sage in Solitude (ISBN 0-87942-238-6), p. 120. This is a reproduction of a steel engraving originally published in The Electrician, 1896. 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.
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