David Dailey: galleries from the 1911 Encyclopedia Britannica (public domain)
David Dailey, a professor of Computer Science at Slippery Rock University, has – among other interesting things, SVG animation with JavaScript and SMIL, and a collection of public domain images from the 1911 Encyclopedia Britannica. Here are some samples: Following:
A flying squirrrel from the “Mammals” category; 
a “Phaeton Butterfly” from the “insects” Category, and a beautiful, wide-ranging section on graphic ornament
Some of those examples, and a few more:
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The Mighty Mo Design Company
