Hans Benndorf (13 December 1870 – 11 February 1953) was an Austrian

physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate caus ...

born in Zurich, and died in

Graz Graz (; sl, Gradec) is the capital city of the Austrian state of Styria and second-largest city in Austria after Vienna. As of 1 January 2021, it had a population of 331,562 (294,236 of whom had principal-residence status). In 2018, the popul ...

. He made several contributions in the field of

seismology Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other ...

and in his research of

atmospheric electricity Atmospheric electricity is the study of electrical charges in the Earth's atmosphere (or that of another planet). The movement of charge between the Earth's surface, the atmosphere, and the ionosphere is known as the global atmospheric electri ...

. He was the son of

archaeologist Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landscap ...

Otto Benndorf Otto Benndorf (13 September 1838 – 2 January 1907) was a German-Austrian archaeologist who was a native of Greiz, Principality of Reuss-Greiz. He was the father of physicist Hans Benndorf (1870–1953). He studied under Friedrich Gottlieb We ...

(1838–1907) and the grandson of

physiologist Physiology (; ) is the scientific study of functions and mechanisms in a living system. As a sub-discipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and biomolecules carry out the chemical a ...

Rudolf Wagner Rudolf Friedrich Johann Heinrich Wagner (30 July 1805 – 13 May 1864) was a German anatomist and physiologist and the co-discoverer of the germinal vesicle. He made important investigations on ganglia, nerve-endings, and the sympathetic nerves ...

(1805–1864). In 1895 he earned his doctorate from the

University of Vienna The University of Vienna (german: Universität Wien) is a public research university located in Vienna, Austria. It was founded by Duke Rudolph IV in 1365 and is the oldest university in the German-speaking world. With its long and rich histor ...

, and subsequently became an assistant to Franz Serafin Exner (1849–1926). In 1904 he became an associate professor of

meteorology Meteorology is a branch of the atmospheric sciences (which include atmospheric chemistry and physics) with a major focus on weather forecasting. The study of meteorology dates back millennia, though significant progress in meteorology did not ...

at the

University of Graz The University of Graz (german: link=no, Karl-Franzens-Universität Graz, ), located in Graz, Austria, is the largest and oldest university in Styria, as well as the second-largest and second-oldest university in Austria. History The unive ...

. In 1910 he replaced

Leopold Pfaundler Leopold Pfaundler von Hadermur (14 February 1839 – 6 May 1920) was an Austrian physicist and chemist born in Innsbruck. He was the father of pediatrician Meinhard von Pfaundler (1872-1947), and the father-in-law of pediatrician Theodor Escheri ...

(1839–1920) as professor of physics, a position he kept until 1936 (forced retirement). In 1945 he resumed his duties in physics at Graz. In 1927 he was elected as a full member of the Austrian Academy of Sciences, and from 1932 to 1934 was university

rector Rector (Latin for the member of a vessel's crew who steers) may refer to: Style or title *Rector (ecclesiastical), a cleric who functions as an administrative leader in some Christian denominations *Rector (academia), a senior official in an edu ...

. From 1924 he worked closely with

geophysicist Geophysics () is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis. The term ''geophysics'' som ...

Alfred Wegener Alfred Lothar Wegener (; ; 1 November 1880 – November 1930) was a German climatologist, geologist, geophysicist, meteorologist, and polar researcher. During his lifetime he was primarily known for his achievements in meteorology and a ...

(1880–1930) at Graz, also maintaining professional ties with

Victor Franz Hess Victor Franz Hess (; 24 June 188317 December 1964) was an Austrian-American physicist, and Nobel laureate in physics, who discovered cosmic rays. Biography He was born to Vinzenz Hess and Serafine Edle von Grossbauer-Waldstätt, in Waldstein ...

(1883–1964) and

climatologist Climatology (from Greek , ''klima'', "place, zone"; and , ''-logia'') or climate science is the scientific study of Earth's climate, typically defined as weather conditions averaged over a period of at least 30 years. This modern field of study ...

Victor Conrad Victor Conrad (1876-1962) was an Austrian-American physicist, seismologist, and meteorologist. He was the first director of the Austrian seismological service and a reputed academician of international accomplishment. He was politically victimized ...

(1876–1962) during his career. With Hess he co-authored a comprehensive treatise on atmospheric electricity (1928). In 1907 he founded a seismological observatory at the physical institute in Graz, and during the same year was awarded with the Ignaz

Lieben Prize The Ignaz Lieben Prize, named after the Austrian banker , is an annual Austrian award made by the Austrian Academy of Sciences to young scientists working in the fields of molecular biology, chemistry, or physics. Biography The Ignaz Lieben Priz ...

for his work on the

propagation Propagation can refer to: *Chain propagation in a chemical reaction mechanism *Crack propagation, the growth of a crack during the fracture of materials *Propaganda, non-objective information used to further an agenda *Reproduction, and other forms ...

seismic wave A seismic wave is a wave of acoustic energy that travels through the Earth. It can result from an earthquake, volcanic eruption, magma movement, a large landslide, and a large man-made explosion that produces low-frequency acoustic energy. S ...

s. In a mine-shaft at Pribram he was able to differentiate between long-distance

earthquakes An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

and local microseismic activity with the use of

seismometer A seismometer is an instrument that responds to ground noises and shaking such as caused by earthquakes, volcanic eruptions, and explosions. They are usually combined with a timing device and a recording device to form a seismograph. The outpu ...

s. Also, he was the first scientist to solve the problem involving

refraction In physics, refraction is the redirection of a wave as it passes from one medium to another. The redirection can be caused by the wave's change in speed or by a change in the medium. Refraction of light is the most commonly observed phenomeno ...

of seismic rays in spherical layers. The term ''Benndorfscher Satz'' (Benndorf's relationship) is used to describe the constancy of the ray parameter across the spherical layers. A device known as a "Benndorf electrometer" is used for atmospheric electrical measurements.
Physik.UIBK Galvanometer

References

* ''Parts of the biography are based on a translation of an article from the

German Wikipedia The German Wikipedia (german: Deutschsprachige Wikipedia) is the German-language edition of Wikipedia, a free and publicly editable online encyclopedia. Founded on March 16, 2001, it is the second-oldest Wikipedia (after the English Wikipedia), ...

.'' 20th-century Austrian physicists 1870 births 1953 deaths Academics of the University of Graz Members of the Austrian Academy of Sciences {{physicist-stub