Large brass parallel ruler "Cap[tain] Fields [sic] Patent", - Lot 134

Lot n° 134
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Estimation :
350 - 400 EUR
Large brass parallel ruler "Cap[tain] Fields [sic] Patent", - Lot 134
Large brass parallel ruler "Cap[tain] Fields [sic] Patent", with its mahogany box. Circa 1870. L_53.3 cm Captain William Andrew Field (c. 1796-1871) added degree scales (as on a protractor) and compass directions to the traditional parallel rulers to facilitate the use of the instrument on navigational charts. He obtained a patent (No. 3549) for these innovations in January 1854.
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