The temperature on January 14, 1911 was between -9.1 °C and -4.6 °C and averaged -6.9 °C. The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
September 25 » An explosion of badly degraded propellant charges on board the French battleship Liberté detonates the forward ammunition magazines and destroys the ship.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
December 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
Day of marriage December 21, 1938
The temperature on December 21, 1938 was between -11.6 °C and -8.6 °C and averaged -9.7 °C. There was 7.7 mm of rain during 12.5 hours. The average windspeed was 2 Bft (weak wind) and was prevailing from the east-northeast. Source: KNMI
July 17 » Douglas Corrigan takes off from Brooklyn to fly the "wrong way" to Ireland and becomes known as "Wrong Way" Corrigan.
September 23 » The Czechoslovak army is mobilized in response to the Munich Agreement.
October 14 » The first flight of the Curtiss P-40 Warhawk fighter plane.
October 30 » Orson Welles broadcasts his radio play of H. G. Wells's The War of the Worlds, causing anxiety in some of the audience in the United States.
December 13 » The Holocaust: The Neuengamme concentration camp opens in the Bergedorf district of Hamburg, Germany.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I13974.php : accessed January 31, 2026), "Hendrika Niesje Vroegop (1911-)".
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