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.
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.