Jolly balance

English
A Jolly balance from 1913

Etymology

Invented by the German physicist Philipp von Jolly in 1864.

Noun

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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