Automatic calculator; Chambon's "Tachypoly plasiasme" length 9 5/8 inches
'Tachypoly Plasiasme' ready reckoner, 1880-1884. Invented by C L Chambon in 1880, the 'Tachypoly plasiasme' ready reckoner showed multiplication tables up to 100 times 100.
- Object Number:
overall (flat): 20 mm x 40 mm x 260 mm, 0.08 kg
- Mr C.L. Chambon
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