gwern comments on Medieval Ballistics and Experiment - Less Wrong
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Your Google skills could use work.
If you copy the image URL and punched it into Google Images, the first hit is http://curvebank.calstatela.edu/harriot/harriot.htm which immediately says "Earlier contributions from Tartaglia's "Nova scientia . . ." (1537):"; as a 2D scan of a public domain work, by Corel v Bridgman, it is also in the public domain, so no one can own the right to it.