The Organum Mathematicum is a fabulous-looking thing:…
A box of sticks which form tables to help with mathematical calculations, sort of like Napier rods, but for artillery and music?! Of course this oddity is a product of Athanasius Kircher!

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A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.

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