Jolly balance

[ jol-ee, yol-ee ]
/ ˈdʒɒl i, ˈyɒl i /

noun

a spring balance used for determining the density of a sample by comparison of its weight in air and water.

Origin of Jolly balance

named after Philipp von Jolly (died 1884), German physicist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019