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NEGRETTI & ZAMBRA, A 19TH CENTURY LACQUERED BRASS INCLINOMETER, No. 14, inscribed Inventor & Patentee G. Francis, C.E. Chester, the silvered dial signed Negretti & Zambra London, with calibrated hinge and with tripod. Note: For measuring angles of elevation and use in the building industry, aviation, shipping and the military. Negretti & Zambra was a producer of scientific and optical instruments and also operated a photographic studio based in London. Enrico Angelo Ludovico Negretti (1818-1879) and Joseph Warren Zambra (1822-1887) formed a partnership in 1850, thereby founding the firm which would eventually be appointed opticians and scientific instrument makers to Queen Victoria, Prince Albert and Edward VII.

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