Josef Maria Eder
| Josef Maria Eder | |
|---|---|
 |
|
| Born |
16 March 1855 Krems an der Donau, Austria-Hungary |
| Died | 18 October 1944 (aged 89) Kitzbühel, Austria |
| Nationality | Austrian |
| Fields | Chemistry of photography |
| Institutions | Vienna University of Technology |
| Alma mater | Vienna University of Technology |
| Notable awards | Lieben Prize 1895 |
Josef Maria Eder 16 March 1855 – 18 October 1944) was an Austrian chemist who specialized in the chemistry of photography.
Eder was born in Krems an der Donau in 1855. He studied chemistry, physics and mathematics at the Vienna University of Technology and at the University of Vienna. In 1876, he received his PhD and in 1879, after his habilitation, became lecturer at the Vienna University of Technology. His research then was focused on the chemistry of photography. After spending some time at the Staatliche Gewerbeschule Vienna, he became lecturer at the Höhere Gewerbeschule Vienna. This change improved his possibilities for doing research. In the following years, Eder developed sensitized gelatin silver process. Orthochromatic photographic plates, in combination with a color filter counter-acting the plates' inhomogeneous sensitivity to light of different wavelengths, yielded black and white images showing all colors of the light in their true brightness. Eder was a professor at the Vienna University of Technology from 1892 to 1925. Eder tried to implement science methods into the development of photographic processes. In particular, he used spectroscopy methods and invented several new instruments including the "Eder-Hecht neutral wedge photometer" (with Walter Hecht (1896–1960)). His another invention was the "mercury oxalate photometer" which was a chemical photometer to measure the intensity of UV radiation. After the effect of X-rays on photographic material was published, Eder did research to improve the sensitivity of photographic material to X-rays. By 1884, Eder started writing his Extensive Handbook of Photography, which is still available as reprint. He was awarded the Lieben Prize in 1895 and became a member of the Austrian Academy of Sciences in 1930. Eder founded the Institute for Photography and Reproduction Techniques (today the ).
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