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Joule's apparatus for determining the mechanical equivalent of heat, 1881.
Joule's apparatus for determining the mechanical equivalent of heat, 1872. A vessel of water, oil or mercury encloses vanes attached to a spindle. Cord is wound round the cylinder and drum. The weight descending against the scale rotates the spindle and vanes. Raising and lowering the weight raises the temperature of the fluid. From the rise in temperature and the distance travelled, the energy used can be calculated. British physicist James Prescott Joule (1818-1889) determined the mechanical equivalent of heat. The unit of energy called the joule is named after him.
Unique Identifier
AR921812
Type
Image
Purpose
Public
Size
4125px × 2551px
Photo Credit
HIP / Art Resource, NY
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Tags
19th century
B&W
B/W
Black & White
Black and white
concept
Energy
Engraving
experiment
Heat
JAMES
James Joule
James Prescott
James Prescott Joule
joule
LIQUID
Measurement
Mechanical
Monochrome
NINETEENTH CENTURY
Oxford Science Archive
Physics
Print Collector1
Science
temperature
WEIGHT