The temperature on July 21, 1911 was between 14.5 °C and 28.1 °C and averaged 21.8 °C. There was 12.2 hours of sunshine (76%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 14 » Roald Amundsen's South Pole expedition makes landfall on the eastern edge of the Ross Ice Shelf.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 21 » President of Mexico Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, concluding the initial phase of the Mexican Revolution.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
September 7 » French poet Guillaume Apollinaire is arrested and put in jail on suspicion of stealing the Mona Lisa from the Louvre museum.
Day of marriage February 5, 1936
The temperature on February 5, 1936 was between -2.9 °C and 2.4 °C and averaged 0.1 °C. There was 1.9 mm of rain during 1.5 hours. There was 1.0 hours of sunshine (11%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
June 26 » Initial flight of the Focke-Wulf Fw 61, the first practical helicopter.
June 28 » The Japanese puppet state of Mengjiang is formed in northern China.
July 26 » Spanish Civil War: Germany and Italy decide to intervene in the war in support for Francisco Franco and the Nationalist faction.
September 14 » Raoul Villain, who assassinated the French Socialist Jean Jaures, is himself killed by Spanish Republicans in Ibiza
October 26 » The first electric generator at Hoover Dam goes into full operation.
December 13 » An annular solar eclipse occurred and was visible from Australia, New Zealand on December 14th (Monday), and Oeno Island in Pitcairn Islands on December 13th (Sunday).
When copying data from this family tree, please include a reference to the origin: J. van Broekhoven, "Database Van Broekhoven", database, Genealogy Online (https://www.genealogieonline.nl/database-van-broekhoven/I70294.php : accessed February 12, 2026), "Hendrik Gerrit Knoop (1911-)".
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