The temperature on June 1, 1927 was between 12.1 °C and 22.8 °C and averaged 15.7 °C. There was 27.8 mm of rain. There was 1.9 hours of sunshine (12%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
February 23 » German theoretical physicist Werner Heisenberg writes a letter to fellow physicist Wolfgang Pauli, in which he describes his uncertainty principle for the first time.
February 23 » U.S. President Calvin Coolidge signs a bill by Congress establishing the Federal Radio Commission (later replaced by the Federal Communications Commission) which was to regulate the use of radio frequencies in the United States.
March 29 » Sunbeam 1000hp breaks the land speed record at Daytona Beach, Florida.
May 1 » The Union Labor Life Insurance Company is founded by the American Federation of Labor.
June 13 » Aviator Charles Lindbergh receives a ticker tape parade down 5th Avenue in New York City.
November 21 » Columbine Mine massacre: Striking coal miners are allegedly attacked with machine guns by a detachment of state police dressed in civilian clothes.
When copying data from this family tree, please include a reference to the origin: Hans Pruckmuller, "Family tree Van Willigen", database, Genealogy Online (https://www.genealogieonline.nl/van-willigen-stamboom/I11066.php : accessed January 23, 2026), "Roelofje Vreeburg (1901-)".
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