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Leslie Differential Thermometer

Leslie Differential Thermometer

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Description
This consists of two glass bulbs that are partially filled with a colored liquid, that are connected by a bent glass tube, and that are mounted on a wooden stand. When one bulb is heated more than the other, the air in that bulb will expand, causing some of the liquid to flow into the other bulb. The form was devised in the early 19th century by John Leslie, a Scottish mathematician and physicist, and soon became a popular science demonstration device. This example is marked “J. W. QUEEN & CO. / PHILADA.” It was used at the Naval Medical School.
Location
Currently not on view
Object Name
Thermometer, Differential
date made
second half of 19th century
Measurements
overall, unfolded: 11 3/8 in x 6 5/8 in x 4 1/2 in; 28.8925 cm x 16.8275 cm x 11.43 cm
overall, folded: 4 3/4 in x 6 5/8 in x 8 in; 12.065 cm x 16.8275 cm x 20.32 cm
ID Number
MG.M-02377
catalog number
M-02377
accession number
100353
Credit Line
U.S. Navy
subject
Education
Science
See more items in
Medicine and Science: Medicine
Data Source
National Museum of American History
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