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Rhabdological abacus, in case. Invented by H. Goodwyn, 1822 Science Museum Group © The Board of Trustees of the Science Museum
Rhabdological abacus, in case. Invented by H. Goodwyn, 1822. With manuscript description by Olinthus Gregory (RAS No.89). Presented to the Royal Astronomical Society in 1824 by Goodwyn family.