The temperature on May 17, 1910 was between 11.4 °C and 23.2 °C and averaged 16.9 °C. There was 5.3 hours of sunshine (34%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
January 13 » The first public radio broadcast takes place; a live performance of the operas Cavalleria rusticana and Pagliacci are sent out over the airwaves from the Metropolitan Opera House in New York.
June 25 » The United States Congress passes the Mann Act, which prohibits interstate transport of women or girls for “immoral purposes”; the ambiguous language would be used to selectively prosecute people for years to come.
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.
July 15 » In his book Clinical Psychiatry, Emil Kraepelin gives a name to Alzheimer's disease, naming it after his colleague Alois Alzheimer.
October 5 » In a revolution in Portugal the monarchy is overthrown and a republic is declared.
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.
Day of marriage July 28, 1952
The temperature on July 28, 1952 was between 7.0 °C and 14.2 °C and averaged 11.4 °C. There was 11.4 mm of rain during 4.7 hours. There was 2.2 hours of sunshine (14%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
June 17 » Guatemala passes Decree 900, ordering the redistribution of uncultivated land.
July 3 » The Constitution of Puerto Rico is approved by the United States Congress.
October 3 » The United Kingdom successfully tests a nuclear weapon to become the world's third nuclear power.
October 14 » Korean War: The Battle of Triangle Hill is the biggest and bloodiest battle of 1952.
November 25 » Agatha Christie's murder-mystery play The Mousetrap opens at the Ambassadors Theatre in London. It will become the longest continuously-running play in history.
December 20 » A United States Air Force C-124 crashes and burns in Moses Lake, Washington killing 87.
Day of death September 11, 1980
The temperature on September 11, 1980 was between 13.1 °C and 18.8 °C and averaged 15.4 °C. There was 9.5 mm of rain during 2.3 hours. There was 7.2 hours of sunshine (55%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
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/I9177.php : accessed March 6, 2026), "Hendrik Sterk (1910-1980)".
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