Except as specifically noted below or in a parenthetical credit in the caption of a figure, all the illustrations in this book are under my own copyright, and are copyleft licensed under the same license as the rest of the book.
In some cases it’s clear from the date that the figure is public domain, but I don’t know the name of the artist or photographer; I would be grateful to anyone who could help me to give proper credit. I have assumed that images that come from U.S. government web pages are copyright-free, since products of federal agencies fall into the public domain. I’ve included some public-domain paintings; photographic reproductions of them are not copyrightable in the U.S. (Bridgeman Art Library, Ltd. v. Corel Corp., 36 F. Supp. 2d 191, S.D.N.Y. 1999).
cover: Daniel Schwen, 2004; GFDL licensed 8Gauss:C.A. Jensen (1792-1870).11 Newton: Godfrey Kneller,1702. 25 Leibniz: Bernhard Christoph Francke,1700. 19 Baseketball photo:Wikimedia Commons user Reisio, public domain.30 Berkeley: public domain. 31 Robinson: public-domain 1951 passport photo.38 Gears:Jared C. Benedict, CC-BY-SA licensed. 122 Euler:Emanuel Hand- mann, 1753. 131 tightrope walker:public domain, since Blondin died in 1897.
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