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The Eratosthenes’ mesolabio (mean-taker)

It is a brilliant tool that was invented by Eratosthenes in order to achieve the interjection of two or more proportional means between two given line segments. In this way the solution of the Delian problem that concerned the doubling of cube was also achieved. They were constituted by a rectangle frame in the form of “Π” with a stable rectangle triangle and two or more sliding rectangles or triangles on uneven grooves inside the frame.

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