February 9 » William G. Morgan creates a game called Mintonette, which soon comes to be referred to as volleyball.
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
September 18 » The Atlanta Exposition Speech on race relations is delivered by Booker T. Washington.
October 8 » Korean Empress Myeongseong is assassinated by Japanese infiltrators.
October 22 » In Paris an express train derails after overrunning the buffer stop, crossing almost 30 metres (100ft) of concourse before crashing through a wall and falling 10 metres (33ft) to the road below.
December 28 » Wilhelm Röntgen publishes a paper detailing his discovery of a new type of radiation, which later will be known as x-rays.
Day of marriage July 22, 1920
The temperature on July 22, 1920 was between 14.1 °C and 21.8 °C and averaged 17.5 °C. There was 1.4 mm of rain. There was 4.8 hours of sunshine (30%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 10 » The Treaty of Versailles takes effect, officially ending World War I.
February 20 » An earthquake kills between 114 and 130 in Georgia and heavily damages the town of Gori.
March 22 » Azeri and Turkish army soldiers with participation of Kurdish gangs attacked the Armenian inhabitants of Shushi (Nagorno Karabakh).
May 16 » In Rome, Pope Benedict XV canonizes Joan of Arc.
August 10 » World War I: Ottoman sultan Mehmed VI's representatives sign the Treaty of Sèvres that divides up the Ottoman Empire between the Allies.
December 3 » Following more than a month of Turkish–Armenian War, the Turkish dictated Treaty of Alexandropol is concluded.
Day of death April 18, 1973
The temperature on April 18, 1973 was between 3.8 °C and 9.2 °C and averaged 6.3 °C. There was 3.5 mm of rain during 3.0 hours. There was 1.0 hours of sunshine (7%). The almost completely overcast was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from Thursday, July 20, 1972 to Friday, May 11, 1973 the cabinet Biesheuvel II, with Mr. B.W. Biesheuvel (ARP) as prime minister.
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
January 8 » Watergate scandal: The trial of seven men accused of illegal entry into Democratic Party headquarters at Watergate begins.
January 22 » The crew of Apollo 17 addresses a joint session of Congress after the completion of the final Apollo moon landing mission.
April 4 » The Twin Towers of the World Trade Center in New York City are officially dedicated.
April 19 » The Portuguese Socialist Party is founded in the German town of Bad Münstereifel.
November 1 » Watergate scandal: Leon Jaworski is appointed as the new Watergate Special Prosecutor.
November 16 » U.S. President Richard Nixon signs the Trans-Alaska Pipeline Authorization Act into law, authorizing the construction of the Alaska Pipeline.
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/I17303.php : accessed March 6, 2026), "Thomas van der Ploeg (1895-1973)".
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