The temperature on January 20, 1915 was between 1.1 °C and 4.9 °C and averaged 3.4 °C. There was 0.7 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. 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.
March 20 » Albert Einstein publishes his general theory of relativity.
April 22 » The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres.
May 7 » World War I: German submarine U-20 sinks RMS Lusitania, killing 1,198 people, including 128 Americans. Public reaction to the sinking turns many former pro-Germans in the United States against the German Empire.
July 16 » Henry James becomes a British citizen to highlight his commitment to Britain during the first World War.
September 5 » The pacifist Zimmerwald Conference begins.
November 25 » Albert Einstein presents the field equations of general relativity to the Prussian Academy of Sciences.
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The Family tree Beumkes / Jonkers / Van Atten / Hogeweg publication was prepared by Marina Beumkes (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Marina Beumkes, "Family tree Beumkes / Jonkers / Van Atten / Hogeweg", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-atten/I2575.php : accessed January 8, 2026), "Jan Arendsen (1912-1915)".
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