Mercury-in-glass thermometer, 18th century.
UNITED KINGDOM - APRIL 03: This mercury-in-glass thermometer was used in the demonstration in which sal ammoniac (ammonium chloride) was dropped in dilute sulphuric acid. The whole apparatus was in a receiver on the air pump with the air removed. This thermometer showed that the temperature of the 'Efervescence' given off during the reaction was lower than that of the surroundings. The thermometer is graduated from -20 to 210 Fahrenheit. The scale on the left of the tube is marked in 2 degree intervals, and the scale on the right is offset by a degree to enable the temperature to be estimated to the nearest degree. The instrument was made by George Adams, instrument maker to the king. (Photo by SSPL/Getty Images)
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Credit:
Editorial #:
90737083
Collection:
SSPL
Date created:
April 03, 1995
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Release info:
Not released. More information
Source:
SSPL
Object name:
10191894
Max file size:
2776 x 3504 px (9.25 x 11.68 in) - 300 dpi - 2 MB