411 REFERENCE · Wiktionary
Fortin barometer
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Invented by Jean Nicolas Fortin.
Noun
A kind of barometer using a variable-displacement mercury cistern, usually constructed with a thumbscrew pressing on a leather diaphragm bottom, which compensates for displacement of mercury in the column with varying pressure.
en eponyms