DeviantArt YCH dividers
(100pt)
https://t.co/JlEXeJ3cL7

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A large case of mathematical instruments by D. Lusuerg, Rome, 1701; the set is unusually extensive, and includes ordinary dividers, a geometric quadrant, a circle of degrees with pointers, a universal sundial, and a set of 'Napier's Rods' https://t.co/MNQniqEUgt

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