Admiral Sir Alexander Milne (1806-96) designed a self-recording mercurial barometer in 1857. Within ten years Negretti and Zambra had designed a modified version of the instrument for sale to the general public, and the present lot is an example. For a similar mercury barograph see Edwin Banfield Barometers, Aneroid and Barographs Baros Books 1985 fig.96
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