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Reversing thermometer with Magnaghi frame for taking sea temperatures at depth by Negretti and Nambra

1896
Reversing mercury thermometer frame for holding thermometer when taking sea temperatures at depth, unsigned, c.1882. The frame design is credited to Admiral Magnaghi, Hydrographer to the Royal Italian Navy, and was marketed by Negretti and Zambra from 1885.

Reversing thermometer with Magnaghi frame for taking sea temperatures at depth

about 1882
Reversing mercury thermometer in ‘Scottish Pattern’ frame with messenger release for taking sea temperatures at depth, made by Negretti and Zambra, London, UK, 1896.

Reversing thermometer for taking sea temperatures at depth, in ‘Scottish Pattern’ frame

1896
Reversing mercury thermometer for taking sea temperatures at depth, made by Negretti and Zambra, London, 1872-1875. This thermometer was taken by Captain George Nares aboard HMS Alert as he led the British Arctic Expedition (1875-1876), attempting to reach the North Pole via Smith Sound, west of Greenland. Its design was tested, and modified, during the Challenger expedition (1872-1876).

Reversing thermometer for taking sea temperatures at depth, used aboard HMS Alert, British Arctic Expedition

1872-1875