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Jolly balance

From Wiktionary, the free dictionary

English

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A Jolly balance from 1913
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Etymology

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Invented by the German physicist Philipp von Jolly in 1864.

Noun

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Jolly balance (plural Jolly balances)

  1. An instrument for determining specific gravity by comparing how much an object stretches a spring when held in a pan hanging in the air to how much that same object stretches a spring when held in a pan underwater.
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