Carl August von Steinheil

Carl August von Steinheil
Carl August von Steinheil
Born	12 October 1801; Ribeauvillé, Alsace
Died	14 September 1870 (aged 68); Munich, Bavaria
Resting place	Alter Südfriedhof, Munich; 48°07′38″N 11°33′54″E / 48.127222°N 11.565°E
Citizenship	German
Alma mater	University of Erlangen
Known for	Steinheil doublet; Earth-return telegraph; Ground (electricity)
	Scientific career
Fields	Astronomy, Physics, Engineering, Mathematics
Institutions	University of Munich; Austrian Trade Ministry; C. A. Steinheil & Söhne; Deutsch-Österreichischer Telegraphenverein; Trade Ministry of Bavaria

Carl August von Steinheil (12 October 1801 – 14 September 1870) was a German physicist, inventor, engineer and astronomer.

Biography edit

Reading telescopes by C.A. Steinheil purchased in 1865 on display in the Teylers Instrument Room

Steinheil was born in Ribeauvillé, Alsace. He studied law in Erlangen since 1821. He then studied astronomy in Göttingen and Königsberg. He continued his studies in astronomy and physics while living in his father's manor in Perlachseck near Munich. From 1832 to 1849, Steinheil was professor for mathematics and physics at the University of Munich.

In late 1838 or early 1839, Steinheil, along with Franz von Kobell, used silver chloride and a cardboard camera to make pictures in negative of the Frauenkirche and other Munich buildings, then taking another picture of the negative to get a positive, the actual black and white reproduction of a view on the object. The pictures produced were round with a diameter of 4 cm, the method was later named the “Steinheil method.” Several of these photographs were exhibited by Steinheil throughout April and Summer 1839. In July 1839, Steinheil demonstrated his photography method at Nymphenburg Palace in the presence of Queen Therese.^[1]^[2]

Steinheil was also one of the first to use the daguerreotype in Germany. By December 1839, he made the first portable metal camera in the world. It was nineteen times smaller than the camera sold by Daguerre. At least ten of these cameras were manufactured.^[2]^[3]^[4]

Steinheil and Kobell's silver chloride photograph of Frauenkirche from the Old Academy, between Autumn 1838 and April 1839

In 1846, Steinheil travelled to Naples to install a new system for weight and measure units. Three years later, he was appointed to the Board of Telegraphy of the Austrian Trade Ministry. Steinheil was tasked with designing a telegraph network for the entire empire, and helped to form the Deutsch-Österreichischer Telegraphenverein (German-Austrian Telegraph Society). In 1851, he started the Swiss telegraph network. Steinheil returned Munich as konservator (curator) of the mathematical-physical collections and ministerial secretary in the Trade Ministry of Bavaria.^{[clarification needed]}

In 1854, he founded C. A. Steinheil & Söhne, an optical-astronomical company.^[3]^[4] The company built telescopes, spectroscopes and photometers – one of Steinheil's inventions, used to measure brightness. C.A. Steinheil & Söhne produced large telescopes for observatories in Uppsala, Mannheim, Leipzig, Utrecht.^[3]^[4] The company also produced refractors and reflectors with silver-covered mirrors. The process for creating the silvering was developed by Steinheil's friend Justus Liebig. In 1862, Steinheil's sons started managing the company.

Steinheil died in Munich in Bavaria on 14 September 1870. He was buried in the Alter Südfriedhof cemetery.

Inventions edit

Ground electricity
Print telegraph (not made public)
Electric clock
Steinheil script (code to print dots on paper via telegraph, not used due to the adoption of Morse code)
Photographic process on silver chloride paper (together with Franz von Kobell)
Steinheil doublet, a flint-first achromatic doublet
Silver coating of curved glass surfaces (together with Léon Foucault) paving the way for the rise of reflecting telescopes.

Legacy edit

Some sources state that Steinheilite, a transparent mineral that resembles blue quartz but is actually a form of iolite, was named after Carl von Steinheil.^[4] However, the name was in use as early as 1811, too early to be named after Carl von Steinheil, and sources from that time instead attribute it to Fabian Steinheil, the Russian military governor of Finland.^[5]

References edit

^ "Steinheil-Verfahren". Archived from the original on 2007-09-29. Retrieved 2006-08-04.
^ ^a ^b Cornwall, James E. (1979). Die Frühzeit der Fotografie in Deutschland 1839 - 1869. Die Männer der ersten Stunden und ihre Verfahren (in German). VWI.
^ ^a ^b ^c Gilman, D. C.; Peck, H. T.; Colby, F. M., eds. (1905). "Steinheil, Karl August" . New International Encyclopedia (1st ed.). New York: Dodd, Mead.
^ ^a ^b ^c ^d Rines, George Edwin, ed. (1920). "Steinheil, Karl August" . Encyclopedia Americana.
^ Sowerby, James (1811), Exotic mineralogy: or, Coloured figures of foreign minerals: as a supplement to British mineralogy, B. Meredith, p. 173.

External links edit

Carl August von Steinheil in the German National Library catalogue

[1] "Steinheil-Verfahren". Archived from the original on 2007-09-29. Retrieved 2006-08-04.

[:0-2] Cornwall, James E. (1979). Die Frühzeit der Fotografie in Deutschland 1839 - 1869. Die Männer der ersten Stunden und ihre Verfahren (in German). VWI.

[nie-3] Gilman, D. C.; Peck, H. T.; Colby, F. M., eds. (1905). "Steinheil, Karl August" . New International Encyclopedia (1st ed.). New York: Dodd, Mead.

[amer-4] Rines, George Edwin, ed. (1920). "Steinheil, Karl August" . Encyclopedia Americana.

[5] Sowerby, James (1811), Exotic mineralogy: or, Coloured figures of foreign minerals: as a supplement to British mineralogy, B. Meredith, p. 173.

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