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~1830 Oxbone Architect's Sector by T. and H. Doublett, London. According to the Webster Signature database, Thomas and Henry or Thomas and Hannah Doublett, instrument makers, worked at 6 Moorgate Street, Bank, or 48 City Road Finsbury Square, all in London c. 1830[^see also Royal Scottish Museum, "Special Exhibition of the St. Andrews Univeristy Astrolabes", Edinburgh, 1959; and History of Microscopy Museum of the Inst. of the History of Natural Science of the Acad. of Science of the U.S.S.R., Moscow., NIM, OIM.^]

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