Ernst Gumlich
Ernst Carl Adolph Gumlich (born April 23, 1859 in Ahorn ; † February 12, 1930 in Berlin ) was a German physicist .
His father Johann Karl Ernst Gumlich (* 1816) was pastor in Heldritt and Ahorn and, from 1868, chief pastor of Neustadt.
From Easter 1878 he studied physics , mathematics and natural sciences in Jena , Tübingen and Berlin. In 1883 he passed the senior teacher examination in Berlin and in 1885 he received his doctorate in Jena on the "Theory of Newtonian color rings in continuous light". From 1887 he worked at the Physikalisch Technische Reichsanstalt in Berlin. In 1898 he became professor and head of the local magnetic laboratory. He was appointed a secret councilor.
Gumlich mainly investigated magnetic materials with alternating magnetization such as the course of eddy current and hysteresis losses . He also developed measuring methods for magnetic properties such as the yoke-isthmus method and improved the Epstein method .
He recognized the parallelism of the ferromagnetic properties, especially with the electrical conductivity . In the summer of 1900 he discovered that even a small addition of silicon in iron multiplied the electrical specific resistance and thus the eddy current losses could be significantly reduced while the magnetic properties remained the same . He stimulated the rolling mills to manufacture alloyed sheet metal ( dynamo sheet ).
Gumlich's grave is located in the south-west cemetery in Stahnsdorf .
literature
- Walter Fritz: Gumlich, Ernst. In: New German Biography (NDB). Volume 7, Duncker & Humblot, Berlin 1966, ISBN 3-428-00188-5 , p. 304 f. ( Digitized version ).
Individual evidence
- ↑ Ed. Houdremon: Introduction to special steel . Springer, 1935, p. 153 ( Google Books ).
- ↑ Peter Bussemer, Kurt Häßner, Gudrun Häßner, Martin Roth: PTR employees' lives after the war. (pdf) In: PTB-Mitteilungen 123 Heft 1, p. 65. 2013, accessed on February 25, 2018 .
| personal data | |
|---|---|
| SURNAME | Gumlich, Ernst |
| ALTERNATIVE NAMES | Gumlich, Ernst Carl Adolf |
| BRIEF DESCRIPTION | German physicist |
| DATE OF BIRTH | April 23, 1859 |
| PLACE OF BIRTH | Maple (near Coburg) |
| DATE OF DEATH | February 12, 1930 |
| Place of death | Berlin |