The temperature on December 9, 1910 was between 4.6 °C and 10.5 °C and averaged 7.4 °C. There was 0.9 mm of rain. There was 5.8 hours of sunshine (74%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
January 15 » Construction ends on the Buffalo Bill Dam in Wyoming, United States, which was the highest dam in the world at the time, at 325ft (99m).
May 4 » The Royal Canadian Navy is created.
July 4 » The Johnson–Jeffries riots occur after African-American boxer Jack Johnson knocks out white boxer Jim Jeffries in the 15th round. Between 11 and 26 people are killed and hundreds more injured.
August 29 » The Japan–Korea Treaty of 1910, also known as the Japan–Korea Annexation Treaty, becomes effective, officially starting the period of Japanese rule in Korea.
November 7 » The first air freight shipment (from Dayton, Ohio, to Columbus, Ohio) is undertaken by the Wright brothers and department store owner Max Moorehouse.
December 3 » Modern neon lighting is first demonstrated by Georges Claude at the Paris Motor Show.
Day of marriage September 6, 1937
The temperature on September 6, 1937 was between 7.1 °C and 22.0 °C and averaged 15.2 °C. There was 0.1 mm of rain. There was 11.0 hours of sunshine (83%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
February 16 » Wallace H. Carothers receives a United States patent for nylon.
February 21 » The League of Nations bans foreign national "volunteers" in the Spanish Civil War.
May 26 » Walter Reuther and members of the United Auto Workers (UAW) clashed with Ford Motor Company security guards at the River Rouge Complex complex in Dearborn, Michigan, during the Battle of the Overpass.
June 14 » Pennsylvania becomes the first (and only) state of the United States to celebrate Flag Day officially as a state holiday.
July 26 » Spanish Civil War: End of the Battle of Brunete with the Nationalist victory.
December 16 » Theodore Cole and Ralph Roe attempt to escape from the American federal prison on Alcatraz Island in San Francisco Bay; neither is ever seen again.
When copying data from this family tree, please include a reference to the origin: Jan Kaper, "Family tree Kaper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kaper/I36611.php : accessed January 28, 2026), "Harmina van Groenenbergh (1910-)".
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