Louis Hackethal

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Louis Hackethal (born January 31, 1837 in Duderstadt ; † April 8, 1911 in Hanover ) was involved in the development of the German telegraph and telephone system as the inventor of the Hackethal wire .

Life

Memorial plaque on the house, Scharrenstrasse 20, in Duderstadt

Louis Hackethal was born as the second son of Carl and Christiane Hackethal. After graduating from high school in 1855, he joined the “Royal Post and Telegraph Administration” in Hanover. From 1875 to 1899 he was telegraph director and head of the telephone exchanges in Hanover and Bremen.

Patents

As a telegraph director and in retirement he was looking for a good, weatherproof insulation material for telephone lines. It had often been observed on gas pipes that they were sometimes unsuitable as electrical conductors - especially if they were to be misused for lightning rods. In 1894 he noticed that an iron girder painted with red lead that had been lying outside for 18 years was completely electrically isolated from the ground. He realized that red lead in a certain composition and under certain conditions provides exceptionally good insulation and weather resistance. While Jacob Berliner , commercial director of the Hanoverian "Berliner Telephonfabrik", was preparing the industrial production of Hackethal's wire and cables as early as 1898, Louis Hackethal had two inventions patented in 1900 :

  • Insulation material for electrical apparatus and lead wires
  • Procedure for eliminating the influence of overhead electrical cables for telephone purposes. He brought the outgoing and return lines together in a very small space by placing them on the same insulator and twisted them by changing the attachment points from insulator to insulator. Both lines were tied together at the crossing points and were thus given a fixed mutual position. Of course, that was only possible with good insulation. This made it possible to make calls without any background noise.

Shortly before his death in 1910 Hackethal patented one:

  • Insulator with side extensions to accommodate double cables.

Hackethal Wire Company

In 1900 the brothers Emil , Jacob and Josef Berliner founded the Hackethal-Draht-Gesellschaft mbH in Hanover. The production of the Hackethal wire was initially commissioned and distributed by J. Berliner Telefonfabrik on Kniestraße. There the brothers also made the first records for Deutsche Grammophon and the British Gramophone Company . It was not until 1903 that the company's own wire production began on Nicolaistraße in order to meet the demand with qualitative improvements.

In 1906 a wire and cable factory was set up in the municipality of Brink on Stader Chaussee (today Vahrenwalder Straße ), covering the entire market . The factory premises were located in Wiesenau and from 1938 belonged to the municipality of Langenhagen , from 1974 to Hanover as the Brink-Hafen district . Louis Hackethal became a co-partner for financial security and further development of his inventions.

Hackethal-Draht- & Kabel-Werke AG shares of RM 1000 in September 1928

With the takeover of this company, Hackethal-Draht- & Kabel-Werke AG was founded on October 21, 1907 (with effect from January 1, 1907) . Their task was the "production of all kinds of bare and insulated wires for electrical engineering purposes as well as of low and high-voltage cables and fittings, seamlessly drawn tubes, hollow and solid rods, etc. made of copper, brass and aluminum". Under the sole director Richard Platz , the company rose within three decades to become one of the most important cable and metalworks in Europe.

In 1912 the company joined the Association of German Power Cable Manufacturers and the Brinker Hafengesellschaft . The contacts to Gutehoffnungshütte from 1922 onwards led to their holdings of more than 50% until 1936. It was not until the end of the Second World War that the company was integrated into armaments production; more than 70% of the production facilities were destroyed in the air raids on Hanover .

The restart in 1945 initially only allowed the production of aluminum saucepans. In 1946 the company was removed from the dismantling list. After the reconstruction was completed in 1950, the development of the corrugated jacket for products with flexible sheathing began. Along with Hackethal-Draht, they became the company's trademark. The high-frequency cables and radio relay systems produced from the 1970s and 1980s onwards became equally well known.

1966 merged Gutehoffnungshütte subsidiaries Osnabrücker copper and wire Werke AG and Hackethal AG to kabelmetal . This company was derived from the telegraph address "kabelmetall", which is limited to 10 letters. After a few years, kabelmetall electro GmbH became an independent company from their cable and line activities in Hanover , the majority of which was taken over by the French CDL Les Cables de Lyon in 1982 . Kabelmetall electro AG had become a leading company in energy and communications technology by around 1990 . It had seven domestic plants and holdings in numerous domestic and foreign companies.

After the merger with Kabelrheydt AG took place in 1992 under the umbrella of Alcatel Germany GmbH the foundation of Alcatel Kabel Beteiligungs-AG , whose products ranged from cables over cellular antennas to the car electronics. Various reasons for economic difficulties from the mid-1990s led to concentrations and layoffs. At the beginning of the 21st century, this resulted in the Alcatel subsidiary RFS - Radio Frequency Systems , which became the market leader in Europe with its high-frequency cables and has its German headquarters in Hanover.

Keymile / DZS - Dasan Zhone Solutions

In 2002 Datentechnik AG took over Ascom Transmissions AG from Ascom Holding and founded Keymile GmbH , which in the following year took over Ke Kommunikation-Elektronik GmbH, a successor company to Hackethal Draht GmbH. Datentechnik GmbH was then sold again and two companies from the network area were acquired. In 2017, Keymile focused on broadband networks and at the beginning of 2019 was taken over by the American-Korean network supplier DASAN Zhone Solutions from Oakland, Ca., who established its European headquarters in Hanover. Keymile achieved sales of 65.7 million euros in 2017 and 42.9 million euros in 2018 after the sale of the Mission-Critical Communication Networks division to ABB .

Publications

  • Laying of telegraph and telephone lines ; in: Dinglers Polytechnisches Journal ; Issue 316, 1901

literature

  • without author: Liquid red lead as an insulating medium for electrical lines. In: Helios, specialist and export journal for electrical engineering. Issue 7, 1901, pp. 28 and 74 f.
  • Gert von Klaß: 50 years of Hackethal-Draht- und Kabel-Werke A.-G., Hanover. Hoppenstedt, Heppenheim an der Bergstrasse 1950.
  • Helmut Plath , Herbert Mundhenke , Ewald Brix : Home chronicle of the city of Hanover. Cologne 1956, p. 373 ff.
  • Albert Lefèvre: The contribution of the Hanoverian industry to technical progress. In: Hannoversche Geschichtsblätter , New Series. Volume 24, Hanover 1970, p. 274 ff.
  • Waldemar R. Röhrbein , Klaus Mlynek u. a. (Ed.): Stadtlexikon Hannover . From the beginning to the present. Schlütersche, Hannover 2009, ISBN 978-3-89993-662-9 , p. 246.

Web links

Commons : Louis Hackethal  - collection of pictures, videos and audio files

Individual evidence

  1. ↑ Hannoversches Biographisches Lexikon p.144 Retrieved on August 26, 2018.
  2. ↑ Helios: Fach- und Export-Zeitschrift für Elektrotechnik, Volume 7, 1901, p. 28.
  3. ^ RFS: history. Retrieved December 20, 2019 .
  4. ↑ dzs: press release from January 15, 2019. Retrieved December 16, 2019 .
personal data
SURNAME Hackethal, Louis
BRIEF DESCRIPTION German inventor of the Hackethaldraht
DATE OF BIRTH January 31, 1837
PLACE OF BIRTH Duderstadt
DATE OF DEATH April 8, 1911
Place of death Hanover