Ehrenfried Walther von Tschirnhaus

Ehrenfried Walther von Tschirnhaus , born in Kieslingswalde, close to Görlitz (Germany) the April 10th 1651 and deceased with Dresden the October 11th 1708, was a Mathématicien and German physicist .

Physicist and geometrician born in a noble and rich family, it served in 1672 against the France, then travelled to the Netherlands, where it supplemented its studies with the Université of Leyde, in England, in Italy, Sicily, and Germany.

It came four times to Paris, and was named there associated member of the Academy of Science.

It improved the optical instruments, establishes superb glassmakings in Saxony.

It manufactured a convex lens on the two sides, which had 32 feet (10™, 70) from hearth and 1 foot (0™, 33) diameter, and of extreme glasses of a great power, known as Caustique S of Tschirnhausen.

One owes him also the discovery of a Porcelaine similar to that of the China.

In addition to Memories , in the collection of the Academy of Science, it left some works, of which the most estimated are:

Medicina corporis , Amsterdam, 1686;
Medicina lied , Amsterdam, 1687. This last is a treaty of logic especially intended to train geometricians.

Transformation of Tschirnhaus

Orthography of the name

The orthography of the name mainly oscillated between the final in - haus and that in - hausen: whereas the two books of Tschirnhaus which one can find on (http:/gallica.bnf.fr Gallica] are without name of author, one finds - haus in the book of the Hospital (1696), in the Praises of Fontenelle (1699) but - hausen in the Encyclopedia of Diderot-In Alembert and the treaty of algebra, in German, of Heinrich Weber (1895). Currently the final - haus is more used but, according to the bibliographical base of American Mathematical Society, it is of a short head (59/44) in the recent articles of mathematics.

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