Jolly balance

Jolly balance
/jol"ee, yol"ee/
a spring balance used for determining the density of a sample by comparison of its weight in air and water.
[named after Philipp von Jolly (d. 1884), German physicist]

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▪ measurement device
      device, now largely obsolete, for determining the specific gravity (relative density) of solids and liquids. Invented by the 19th-century German physicist Philipp von Jolly, it consists in its usual form of a long, delicate, helical spring suspended by one end in front of a graduated scale. To the lower end of the spring is attached a weight pan and below that a small wire basket for samples. The difference in extension of the spring when the sample is suspended in air and in water represents the loss of weight in water; the weight in air divided by the loss of weight in water gives the specific gravity. The specific gravity of a liquid can be obtained by suspending any convenient specimen of a solid first in water and then in the liquid undergoing the test; the ratio of loss of weight of the solid in water and in the test liquid gives the specific gravity of the liquid.

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Universalium. 2010.

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  • jolly balance — ˈjälē , ˈyälē noun Usage: usually capitalized J Etymology: After Philipp von Jolly died 1884 German physicist : a very delicate spring balance used especially for the determination of densities by the method of weighing in air and in water * * *… …   Useful english dictionary

  • Jolly, Philipp Johann Gustav von — • German physicist, born at Mannheim, 26 September, 1809; died at Munich, 24 December, 1884 Catholic Encyclopedia. Kevin Knight. 2006. Jolly, Philipp Johann Gustav Von     Philipp Johann Gustav von Jolly …   Catholic encyclopedia

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