A Daily History of Holes, Dots, Lines, Science, History, Math, Physics, Art, the Unintentional Absurd, Architecture, Maps, Data Visualization, Blank and Missing Things, and so on. |1.6 million words, 7500 images, 4.9 million hits| Press & appearances in The Times, Le Figaro, Mensa, The Economist, The Guardian, Discovery News, Slate, Le Monde, Sci American Blogs, Le Pont, and many othr places… 5000+ total posts since 2008.
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JF Ptak Science Books Quick Post
The “Proportior” (sounding somewhat like an exclamation, like Excelsior!, and looking for all the world like it should be spelled some other more appropriate way) a fabulous desktop/tabletop calculator, as seen in the Science, October 4, 1889:
Thanks to Ray Girvan for the link to a successful download of images for this!