April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
June 22 » British colonial officers Charles Walter Rand and Lt. Charles Egerton Ayerst are assassinated in Pune, Maharashtra, India by the Chapekar brothers and Mahadeo Vinayak Ranade, who are later caught and hanged.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
July 26 » Anglo-Afghan War: The Pashtun fakir Saidullah leads an army of more than 10,000 to begin a siege of the British garrison in the Malakand Agency of the North West Frontier Province of India.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
Day of marriage January 29, 1920
The temperature on January 29, 1920 was between 3.8 °C and 8.5 °C and averaged 6.0 °C. There was 1.7 mm of rain. There was 3.7 hours of sunshine (42%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the 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 7 » The New York State Assembly refuses to seat five duly elected Socialist assemblymen.
January 17 » Alcohol Prohibition begins in the United States as the Volstead Act goes into effect.
February 2 » The Tartu Peace Treaty is signed between Estonia and Russia.
August 16 » The congress of the Communist Party of Bukhara opens. The congress would call for armed revolution.
August 20 » The National Football League is organized as the American Professional Football Conference in Canton, Ohio
October 30 » The Communist Party of Australia is founded in Sydney.
Day of death January 27, 1954
The temperature on January 27, 1954 was between -10.8 °C and -3.8 °C and averaged -8.1 °C. There was 7.6 hours of sunshine (86%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the east. Source: KNMI
June 14 » U.S. President Dwight D. Eisenhower signs a bill into law that places the words "under God" into the United States Pledge of Allegiance.
June 27 » The Obninsk Nuclear Power Plant, the Soviet Union's first nuclear power station, opens in Obninsk, near Moscow.
September 17 » The novel Lord of the Flies by William Golding is first published.
October 10 » The Minister of Foreign Affairs of the Sultanate of Muscat, Neil Innes, sends a signal to the Sultanate's forces, accompanied with oil explorers, to penetrate Fahud, marking the beginning of Jebel Akhdar War between the Imamate of Oman and the Sultanate of Muscat.
November 7 » In the US, Armistice Day becomes Veterans Day.
December 4 » The first Burger King is opened in Miami, Florida.
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/I7823.php : accessed February 15, 2026), "Paulus Kok (1897-1954)".
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