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 other places… 5000+ total posts since 2008.
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JF Ptak Science Books Quick Post
This Russian 20″ smooth ore cannon weighed 44.5 tons and shot a 900-pound projectile and used 117 pounds of explosive charge to do that. The concussion wave from the firing of this beast was said to be felt 1/3 of a mile away where it would topple bad chimneys.
Source: Scientific American, December 14, 1872.
