JF Ptak Science Books: Some Good Letters

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 Point, and many other places... 5000+ total posts since 2008.. Contact johnfptak at gmail dot com

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Some Good Letters

JF Ptak Science Books Quick Post

I found a small notice in the September 18, 1877 issue of Scientific American on employing the following chart for an eye exam--and I just liked the big B and thought to share it. (The original measures 1.5x2.5 inches.) That's it!

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