April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
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.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
September 12 » Tirah Campaign: In the Battle of Saragarhi, ten thousand Pashtun tribesmen suffer several hundred casualties while attacking 21 Sikh soldiers in British service.
December 6 » London becomes the world's first city to host licensed taxicabs.
Day of marriage August 12, 1926
The temperature on August 12, 1926 was between 9.4 °C and 18.4 °C and averaged 14.1 °C. There was 7.8 mm of rain. There was 9.6 hours of sunshine (64%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
January 8 » Crown Prince Nguyễn Phúc Vĩnh Thuỵ ascends the throne to become the last monarch of Vietnam.
January 26 » The first demonstration of the television by John Logie Baird.
May 22 » Chiang Kai-shek replaces the communists in Kuomintang China.
August 5 » Harry Houdini performs his greatest feat, spending 91 minutes underwater in a sealed tank before escaping.
October 14 » The children's book Winnie-the-Pooh, by A. A. Milne, is first published.
November 25 » The deadliest November tornado outbreak in U.S. history kills 76 people and injures more than 400.
Day of death May 14, 1967
The temperature on May 14, 1967 was between 12.0 °C and 25.4 °C and averaged 18.9 °C. There was 4.3 mm of rain during 1.5 hours. There was 7.9 hours of sunshine (51%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
May 24 » Egypt imposes a blockade and siege of the Red Sea coast of Israel.
July 6 » Nigerian Civil War: Nigerian forces invade Biafra, beginning the war.
September 11 » China's People's Liberation Army (PLA) launched an attack on Indian posts at Nathu La, Sikkim, India, which resulted a military clashes.
October 2 » Thurgood Marshall is sworn in as the first African-American justice of the United States Supreme Court.
October 8 » Guerrilla leader Che Guevara and his men are captured in Bolivia.
November 28 » The first pulsar (PSR B1919+21, in the constellation of Vulpecula) is discovered by two astronomers Jocelyn Bell Burnell and Antony Hewish.
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/I17816.php : accessed February 12, 2026), "Jacoba Wolfert (1897-1967)".
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