Leo Graetz

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Leo Graetz

Leo Graetz (born September 26, 1856 in Breslau , † November 12, 1941 in Munich ) was a German physicist .

Life

Graetz was the son of the famous Jewish historian Heinrich Graetz . He studied mathematics and physics in Breslau and Berlin . He received his doctorate in Breslau in 1879, then moved to the University of Strasbourg in 1880 , where he became August Kundt's assistant in 1881 . He completed his habilitation at the Ludwig Maximilians University in Munich in 1881 and became an associate professor in 1893. After the appointments of Wilhelm Conrad Röntgen for experimental physics and Arnold Sommerfeld for theoretical physics, the work opportunities for Graetz were severely restricted. As a kind of compensation, he received a personal ordinariate for physics in 1908. In 1926 he retired and was awarded the Golden Ring of Honor of the Deutsches Museum .

Graetz dealt among other things with magnetism, electricity and atomic models. The Graetz circuit , a bridge rectifier circuit with four diodes , and the Graetz cell are named after him . The latter is a form of an electrolytic rectifier that is no longer in use today . This consists of an aluminum cup as the outer electrode and is filled with sodium hydroxide solution . Inside the beaker there is an iron / carbon electrode in the sodium hydroxide solution. Depending on the direction, the electrical current is conducted differently between the two electrodes.

Honor

The Leo-Graetz-Strasse in Munich ( Siemens-Siedlung ) and the Leo-Graetz-Weg in Kramerhof as well as the Graetz number were named after him .

Fonts

  • Electricity and its uses for lighting, power transmission, metallurgy, telephony and telegraphy: shown for wider circles . Verlag von J. Engelhorn, Stuttgart 1883. (From 1892 under the shortened title Electricity and its Applications , the German-language standard work on electrical engineering for decades. The last 23rd edition appeared in 1928)
  • Brief outline of the electricity. Engelhorn, Stuttgart 1897.
  • The light and the colors. Teubner, Leipzig / Berlin 1916.
  • The physic. Verlag Naturwissenschaften, Leipzig 1917.
  • The atomic theory in its latest development. Engelhorn, Stuttgart 1918.

literature

Web links