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| [[File:Jolly-balance.jpg|thumb|right|100px|A jolly balance from 1913]]
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| The '''Jolly balance''' is an instrument for determining [[specific gravity|specific gravities]]. Invented by the German physicist [[Philipp von Jolly]] in 1864,<ref>{{de icon}} {{cite journal|first=P.|last=Jolly|title=Eine Federwage zu exacten Wägungen|journal=Sitzb. Akad. Wiss. Miinchen|year=1864|volume=I|pages=162–166|url=http://archiv.ub.uni-heidelberg.de/volltextserver/12720/1/jolly_waage.pdf|trans_title=A spring scale for accurate weighing}}</ref> it consists of a [[spring (device)|spring]] fastened at the top to a movable arm. At the lower end, the spring is provided with two small pans, one suspended beneath the other. The lower pan is kept immersed to the same depth in water, while the other one hangs in the air. On the upright stand behind the spring is a mirror on which is engraved or painted a scale of equal parts. The specific gravity of an object, typically a [[solid]], is determined by noting how much the spring lengthens spring when the object is resting in the upper pan in air (<math>w</math>), and then when the object is moved to the lower pan and immersed in water (<math>w'</math>). The specific gravity is <math>\frac{w}{(w - w')}</math>.<ref>{{cite book|page=516|url=http://books.google.com/books?id=ENpLAAAAMAAJ&pg=PA516|title=Manual of Petrographic Methods|first=Albert|last=Johannsen|year=1918}}</ref>
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| ==See also==
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| *[[Effective mass (spring-mass system)]]
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| == Notes ==
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| {{reflist}}
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| == References ==
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| *{{cite book|url=http://books.google.com/books?id=XA1DAAAAIAAJ&pg=PA193|title=Elementary Crystallography|first=William Shirley|last=Bayley |year=1910|pages=192–193}}
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| {{DEFAULTSORT:Jolly Balance}}
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| [[Category:Weighing instruments]]
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| {{Physics-stub}}
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Latest revision as of 13:29, 5 May 2014
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