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Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, by Casella-Miller, London, c.1880

Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, and subsequently tested by Professor P.G. Tait, by L. Casella of London, c.1880

Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, by Casella-Miller, London, c.1880

Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, by Casella-Miller, London, c.1880

Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, by Casella-Miller, London, c.1880

Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, by Casella-Miller, London, c.1880

Thermometer, deep sea Thermometer, deep sea

Deep sea thermometer used in the 'Challenger' experiments, by Casella-Miller, London, c.1880

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