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Title: Napier's bones
Caption: Napier's bones, an early calculating machine designed by John Napier which converted multiplication problems into a sequence of simple addition.
Credit: Album / SCIENCE SOURCE
Image size: 4500 × 3096 px | 39.9 MB
Print size: 38.1 × 26.2 cm | 1771.7 × 1218.9 in (300 dpi)