The temperature on April 20, 1915 was between 3.3 °C and 12.7 °C and averaged 8.3 °C. There was 1.9 hours of sunshine (13%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the 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 27 » Typhoid Mary, the first healthy carrier of disease ever identified in the United States is put in quarantine for the second time, where she would remain for the rest of her life.
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.
May 22 » Lassen Peak erupts with a powerful force, the only volcano besides Mount St. Helens to erupt in the contiguous U.S. during the 20th century.
June 5 » Denmark amends its constitution to allow women's suffrage.
June 29 » The North Saskatchewan River flood of 1915 is the worst flood in Edmonton history.
July 24 » The passenger ship SSEastland capsizes while tied to a dock in the Chicago River. A total of 844 passengers and crew are killed in the largest loss of life disaster from a single shipwreck on the Great Lakes.
Day of marriage July 17, 1936
The temperature on July 17, 1936 was between 9.8 °C and 23.7 °C and averaged 18.7 °C. There was 10.7 hours of sunshine (66%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
June 26 » Initial flight of the Focke-Wulf Fw 61, the first practical helicopter.
July 20 » The Montreux Convention is signed in Switzerland, authorizing Turkey to fortify the Dardanelles and Bosphorus but guaranteeing free passage to ships of all nations in peacetime.
July 26 » Spanish Civil War: Germany and Italy decide to intervene in the war in support for Francisco Franco and the Nationalist faction.
August 1 » The Olympics opened in Berlin with a ceremony presided over by Adolf Hitler.
August 19 » The Great Purge of the Soviet Union begins when the first of the Moscow Trials is convened.
October 9 » Boulder Dam (later Hoover Dam) begins to generate electricity and transmit it to Los Angeles.
When copying data from this family tree, please include a reference to the origin: W.J. Oving, "Family tree Oving", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-oving/I79063.php : accessed March 15, 2026), "Jan Jacob KOOLENBRANDER (1915-)".
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