411 REFERENCE · Wiktionary
Jolly balance
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
thumb|right|100px|A Jolly balance from 1913
Etymology
Invented by the German physicist Philipp von Jolly in 1864.
Noun
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.
en eponyms