The temperature on April 13, 1915 was between -1.5 °C and 12.9 °C and averaged 6.1 °C. There was 10.2 hours of sunshine (74%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 21 » Kiwanis International is founded in Detroit.
January 25 » Alexander Graham Bell inaugurates U.S. transcontinental telephone service, speaking from New York to Thomas Watson in San Francisco.
February 8 » D. W. Griffith's controversial film The Birth of a Nation premieres in Los Angeles.
March 20 » Albert Einstein publishes his general theory of relativity.
April 5 » Boxing challenger Jess Willard knocks out Jack Johnson in Havana, Cuba to become the Heavyweight Champion of the World.
July 1 » Leutnant Kurt Wintgens of the then-named German Deutsches Heer's Fliegertruppe army air service achieves the first known aerial victory with a synchronized machine-gun armed fighter plane, the Fokker M.5K/MG Eindecker.
When copying data from this family tree, please include a reference to the origin: Helma Bovenschen-van Gelderen, "Genealogy Bovenschen, Looijenga, Van Gelderen en Van Donk", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-bovenschen/I18431.php : accessed August 9, 2025), "Sientje Pieternella Antonia de Jong (1915-)".
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