This Day In History : September 25

1956 United Kingdom

The first submarine transatlantic telephone cable system, the TAT-1, is inaugurated

The TAT-1 (Transatlantic Telephone Cable No. 1) submarine cable system was inaugurated on September 25, 1956. It connected the United States and the United Kingdom, marking a significant milestone in telecommunications by enabling the first transatlantic telephone service.

Also on This Day in History September 25

Discover what happened on September 25 with HISTORY's summaries of major events, anniversaries,
famous births and notable deaths.

Births on This Day, September 25
  • 1866 Thomas Hunt Morgan

    American geneticist and zoologist famous for his experimental research with the fruit fly by which he established the chromosome theory of heredity.

  • 1832 William Le Baron Jenney

    American civil engineer and architect whose technical innovations were of primary importance in the development of the skyscraper.

  • 1846 Wladimir Köppen

    Wladimir (Peter) Köppen was a German meteorologist and climatologist best known for his delineation and mapping of the climatic regions of the world.

  • 1904 Columbus Iselin

    Columbus O'Donnell Iselin was an American oceanographer who was director of the Woods Hole Oceanographic Institution in Massachusetts (1940-50; 1956-57).

  • 1773 Agostino Bassi

    Agostino Bassi, sometimes called de Lodi, was an Italian entomologist. He preceded Louis Pasteur in the discovery that microorganisms can be the cause of disease.

Deaths on This Day, September 25
  • 1986 Nikolay Nikolayevich Semyonov

    Russian physical chemist who shared the 1956 Nobel Prize for Chemistry with Sir Cyril Hinshelwood for “their researches into the mechanism of chemical reactions.”

  • 1898 Louis Laurent Gabriel de Mortillet

    French anthropologist who was the first to organize man's prehistoric cultural developments into a sequence of epochs.

  • 1985 William Cumming Rose

    American biochemist who researched the role of amino acids in nutrition determining which were essential, and calculated the minimum daily requirement for each of them.

  • 1898 Hieronymus Theodor Richter

    German mineralogist who in 1863 was a co-discoverer of the element indium.

  • 1969 Paul Scherrer

    Swiss physicist whose collaboration with Peter Debye produced a method for X-ray diffraction analysis.


The international Convention to Suppress the Slave Trade and Slavery is signed

The international Convention to Suppress the Slave Trade and Slavery was signed on September 25, 1926. It was a significant international agreement aimed at combating and abolishing the global slave trade and slavery practices.

NASA launches the Mars Observer

The Mars Observer spacecraft, also known as the Mars Geoscience/Climatology Orbiter, was a robotic space probe launched by NASA on September 25, 1992, to study the Martian surface, atmosphere, climate and magnetic field.

STS 86 (Atlantis 20) launches into orbit

STS-86 was a Space Shuttle Atlantis mission that launched on September 25, 1997. Its primary objective was to perform the seventh docking of an American Space Shuttle with the Russian space station Mir. During the mission, Atlantis delivered supplies, equipment, and astronauts to Mir, and returned with a crew member who had been aboard Mir for several months.

Henry Ford announces an 8 hour, 5-day work week for workers at the Ford Motor Company

The year 1926 marked a significant turning point in labor history with Henry Ford’s announcement on September 25th regarding the implementation of an 8-hour workday and a 5-day workweek at the Ford Motor Company. This decision, made by one of the most prominent figures in the automotive industry, had far-reaching implications not only for Ford employees but for labor practices worldwide.
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