Kurt Schiffler

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Kurt Schiffler (born April 6, 1896 in Gotha ; † February 25, 1986 in Schorndorf-Miedelsbach ) was a German engineer, inventor and entrepreneur .

Plug-in module from Schiffler (1937)

Schiffler grew up in Gotha ( Thuringia ), where he attended the grammar school and passed his Abitur in 1914 before he was drafted as a soldier for the First World War in the same year. After the war he studied at the Freiberg Mining Academy and at the Technical University of Stuttgart Engineering . Schiffler is the inventor of a ruler with which diameter and symmetry dimensions can be drawn and measured and which he developed as an employee of a machine factory in Esslingen from October 16, 1922 and sold under the abbreviated name DUSYMA ("Diameter Symmetry Scale") . When founded in Stuttgart on 23 June 1923 ram Instrument AG he learned the ram sounds familiar, where he worked from April 1925 as employee Georg ram and sales manager before joining the Dusyma workshops in the October 1925 Stuttgart-Ostheim founded a own model of Stoessel lute designed and Mando sounds produced and sold. The Dusyma company, named after the ruler, developed into a kindergarten supplier and manufacturer of educational toys. To this end, Schiffler cooperated with Erika Hoffmann and Christine Uhl, among others . Dusyma produced various wooden construction kits inspired by Friedrich Fröbel , a plug-in module designed by Schiffler in 1937 was particularly successful.

In 1971 Kurt Schiffler was awarded the Federal Cross of Merit on ribbon.

Schiffler was married twice. A daughter comes from the first marriage, and four more daughters and a son from the second. His youngest daughter, Lulu Schiffler-Betz, took over the management of the Dusyma workshops from him in 1981.

Triangle ABC is divided into triangles ABI, BCI and ACI. The Euler lines of the four triangles e 0 , e 1 , e 2 and e 3 then intersect at the Schiffler point S.

Schiffler, who was very interested in geometry, discovered the following statement about triangles:

If you divide a triangle ABC into three sub-triangles ABI, BCI and ACI using the center of its inscribed circle I, the Euler lines of the three sub- triangles and the starting triangle intersect at a common point.

Schiffler published his discovery in 1985 in the form of a problem ( problem 1018 ) in the Canadian mathematics journal Crux Mathematicorum . The statement has since been referred to as Schiffler's theorem and the common point of intersection as the Schiffler point .

literature

  • Kurt Schiffler: Letter to the editor in: Guitar & Laute 7, 1985, Issue 5, pp. 10 and 12.
  • Lore Thier-Schröter and Hellmut Thier: Kurt Schiffler on his 100th birthday. Founder of the Dusyma workshops. L. Schiffler-Betz, Schorndorf-Miedelsbach 1996.

Web links

Individual evidence

  1. ↑ Kurt Schiffler: Letter to the Editor. In: Guitar & Laute 7, 1985, No. 5, pp. 10 and 12; here: p. 10.
  2. ↑ a b c Lore Thier-Schröter and Hellmut Thier: Kurt Schiffler for his 100th birthday. Founder of the Dusyma workshops. L. Schiffler-Betz, Schorndorf-Miedelsbach 1996, pp. 8-9, 15-17, 23-24, 29-33
  3. ↑ Joe Goggins: The Converse of Schiffler's theorem . Crux Mathematicorum with Mathematical Mayhem, Canadian Mathematical Society, 2007, Volume 33, No. 6, p. 354 ( online copy )
  4. ↑ Kurt Schiffler: Problem 1018 . In: Crux Mathematicorum, Volume 11, No. 2, February 1985, p. 51 ( online copy ); GR Veldkamp, ​​WA van der Spek: Solutions to Problem 1018 . Crux Mathematicorum, Volume 12, No. 6, June 1986, p. 151 ( online copy )
personal data
SURNAME Schiffler, Kurt
BRIEF DESCRIPTION German engineer, inventor and entrepreneur
DATE OF BIRTH April 6, 1896
PLACE OF BIRTH Gotha
DATE OF DEATH February 25, 1986
Place of death Schorndorf-Miedelsbach