Over 130 books are digitized entirely (or nearly so) on the Online Galleries website of the History of Science Collections of the University of Oklahoma Libraries. The Galleries provide over 60,000 high-resolution color images suitable for close scrutiny.
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by Nathan Krämer
on 9/9/2013
Gustave Caillebotte (1848-1894), was a French painter, member and patron of the group of artists known as Impressionists, though he painted in a much more realistic manner than many other artists in the group.
A harmonograph is a mechanical device that uses swinging pendulums to draw pictures, believed to be originally invented in 1844 by Scottish mathematician Hugh Blackburn. This 3-pendulum rotary type of harmonograph gives a wide variety of pleasant results, and is fairly easy to build once you've settled on a design and have acquired the appropriate materials and tools. This is a great project to do with kids and can result in endless experiments creating new types of geometric designs.
