Mahogany cased 8 inch mercury wheel barometer with two engraved silvered dials

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Mahogany cased 8 inch mercury wheel barometer with two engraved silvered dials, the case inlaid with shell & flower motifs and ebony & boxwood stringing, with concave brass bezel and flat glass to the main dial, all surmounted by broken pediment and brass finial, by A. Ortelli, Buckingham, c 1820