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; coloured at a later stage.
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Creative#:
TOP17038249
Source:
達志影像
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RM
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須由TPG 完整授權
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