Johann Heinrich Jakob Müller (born 30 April 1809, Cassel

Kassel

Kassel is a town located on the Fulda River in northern Hesse, Germany. It is the administrative seat of the Kassel Regierungsbezirk and the Kreis of the same name and has approximately 195,000 inhabitants.- History :...

; died 3 October 1875, Freiburg im Breisgau) was a German

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 physicist

Physicist

A physicist is a scientist who studies or practices physics. Physicists study a wide range of physical phenomena in many branches of physics spanning all length scales: from sub-atomic particles of which all ordinary matter is made to the behavior of the material Universe as a whole...

.

Biography

He studied in Darmstadt

Darmstadt

Darmstadt is a city in the Bundesland of Hesse in Germany, located in the southern part of the Rhine Main Area.The sandy soils in the Darmstadt area, ill-suited for agriculture in times before industrial fertilisation, prevented any larger settlement from developing, until the city became the seat...

, Bonn

Bonn

Bonn is the 19th largest city in Germany. Located in the Cologne/Bonn Region, about 25 kilometres south of Cologne on the river Rhine in the State of North Rhine-Westphalia, it was the capital of West Germany from 1949 to 1990 and the official seat of government of united Germany from 1990 to 1999....

, and Giessen, and became a teacher at Darmstadt. In 1844 he was appointed professor of physical sciences at Freiburg

University of Freiburg

The University of Freiburg , sometimes referred to in English as the Albert Ludwig University of Freiburg, is a public research university located in Freiburg im Breisgau, Baden-Württemberg, Germany.The university was founded in 1457 by the Habsburg dynasty as the...

, Baden.

Works

His principal work, Lehrbuch der Physik und Meteorologie (2 vols., Brunswick, 1842; 7th ed., 1868-69), was originally a version of Pouillet's Éléments de physique; and he published a supplement to it, Lehrbuch der kosmischen Physik (1856; 3d ed., 1872). Among his other works are: Grundriss der Physik und Meteorologie (1846; 10th ed., 1869-70; with two supplements); Grundzüge der Krystallographie (1845; 2d ed., 1869); Die constructive Zeichnungslehre (2 vols. 1868); and Anfangsgründe der geometrischen Disciplin für Gymnasien, &c. (3d ed., 1869).