The temperature on July 31, 1927 was between 12.5 °C and 22.2 °C and averaged 17.9 °C. There was 3.2 hours of sunshine (21%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. 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.
May 18 » After being founded for 20 years, the Government of the Republic of China approves Tongji University to be among the first national universities of the Republic of China.
August 23 » Italian anarchists Sacco and Vanzetti are executed after a lengthy, controversial trial.
September 5 » The first Oswald the Lucky Rabbit cartoon, Trolley Troubles, produced by Walt Disney, is released by Universal Pictures.
December 3 » Putting Pants on Philip, the first Laurel and Hardy film, is released.
Day of marriage June 7, 1947
The temperature on June 7, 1947 was between 11.3 °C and 16.0 °C and averaged 13.2 °C. There was 1.2 mm of rain during 1.8 hours. There was 2.8 hours of sunshine (17%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
February 21 » In New York City, Edwin Land demonstrates the first "instant camera", the Polaroid Land Camera, to a meeting of the Optical Society of America.
May 22 » Cold War: The Truman Doctrine goes into effect, aiding Turkey and Greece.
August 14 » Pakistan gains Independence from the British Empire and joins the Commonwealth of Nations.
August 15 » Founder of Pakistan, Muhammad Ali Jinnah is sworn in as first Governor-General of Pakistan in Karachi.
November 18 » The Ballantyne's Department Store fire in Christchurch, New Zealand, kills 41; it is the worst fire disaster in the history of New Zealand.
December 6 » The Everglades National Park in Florida is dedicated.
Day of death April 20, 1950
The temperature on April 20, 1950 was between 6.0 °C and 17.7 °C and averaged 11.6 °C. There was 12.0 hours of sunshine (85%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I182788.php : accessed October 20, 2026), "Aaltje Slotegraaf (1927-1950)".
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