Gustave-Adolphe Hirn

Life

Hirn was born in Logelbach, near Colmar, into the prosperous textile-manufacturing family Haussmann. Baron Haussmann was a cousin. At 19, he entered his grandfather's cotton factory as a chemist. Later he worked as an engineer, and began research on mechanics, especially on calorics.

Hirn carried out numerous experiments during his career, demonstrating the relevance of Carnot's principle in animated engines: the equivalence of thermal and mechanical energy. He traced the flow of energy through the steam engine, documenting its distribution and the disposal of heat. He studied the properties of superheated steam and was the first to employ it at large scale.

His work on thermodynamics is considered a major work of the 19th century. Indeed, he deduced from his work an equation of state that introduced both the notion of free volume and internal pressure, notions that would reappear with the work of van der Waals with a different corpuscular conception.

He was made a member of the French Academy of Sciences in 1867; in 1880 founded a meteorological observatory near Colmar; and later devoted himself to astronomy. Hirn was educated in the shop, and his works are marked by much practical criticism of mere academic theory.

Hirn invented the pandynanometer in 1880 and published a theory of the origin and chemical composition of Saturn's rings, exchanging correspondence with Urbain Jean Joseph Leverrier.

The American Society of Mechanical Engineers elected Hirn an honorary member in 1882.

He made significant contributions to the field of tribology. His study of friction in journal bearings revealed all the essential features of fluid film lubrication, although it lacked theoretical justification. For this contribution, he was named as one of the 23 "Men of Tribology" by Duncan Dowson.

He died in Colmar in 1890.

Honours Chevalier of the Légion d'Honneur (1865)