Technology / Telegraphy:- Polybius' torch telegraph; 2nd cent. BC.(The Greek alphabet was written on 5 plates with 5 rows each; when signalling the number of torches on the left indicated the number of the plate; the torches on the right the row).Copper engr.; 1785; by M黮ler after d'Ivernois.

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TOP17142932

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達志影像

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