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Adolphe Eggis's 'Velographe' of 1886.: Each letter of the alphabet on uderside of disk had to brought into position by moving the disk. Engraving

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World History Archive
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Adolphe Eggis's 'Velographe' of 1886.:  Each letter  of the alphabet on uderside of disk had to brought into position  by moving the disk.  Engraving