Polybius Working on the Polybius Square, from Les Merveilles de la Science, c.1870(Ancient Greek historian Polybius working on the Polybius Square or checkerboard, a system he invented as an aid to telegraphy using sets of torches, from Les Merveilles de la Science, published c.1870 (engraving))French School |
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Undated · engraving
· Picture ID: 1483009
Private Collection / Bridgeman Images |
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