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.
May 26 » Dracula, a Gothic horror novel by Irish author Bram Stoker, is published.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
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 9 » Activist Marguerite Durand founds the feminist daily newspaper La Fronde in Paris.
Day of marriage May 20, 1921
The temperature on May 20, 1921 was between 5.7 °C and 19.3 °C and averaged 12.7 °C. There was 9.6 hours of sunshine (60%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. 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.
March 18 » The Kronstadt rebellion is suppressed by the Red Army.
April 11 » Emir Abdullah establishes the first centralised government in the newly created British protectorate of Transjordan.
July 27 » Researchers at the University of Toronto, led by biochemist Frederick Banting, prove that the hormone insulin regulates blood sugar.
October 19 » The Portuguese Prime Minister and several officials are murdered in the Bloody Night coup.
October 29 » United States: Second trial of Sacco and Vanzetti in Boston, Massachusetts.
November 4 » Japanese Prime Minister Hara Takashi is assassinated in Tokyo.
Day of death April 27, 1991
The temperature on April 27, 1991 was between 3.0 °C and 13.8 °C and averaged 8.1 °C. There was 10.7 hours of sunshine (73%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from Tuesday, November 7, 1989 to Monday, August 22, 1994 the cabinet Lubbers III, with Drs. R.F.M. Lubbers (CDA) as prime minister.
February 1 » A runway collision between USAir Flight 1493 and SkyWest Flight 5569 at Los Angeles International Airport results in the deaths of 34 people, and injuries to 30 others.
February 7 » The Troubles: The Provisional IRA launched a mortar attack on 10 Downing Street in London, the headquarters of the British government.
February 13 » Gulf War: Two laser-guided "smart bombs" destroy the Amiriyah shelter in Baghdad. Allied forces said the bunker was being used as a military communications outpost, but over 400 Iraqi civilians inside were killed.
May 19 » Croatians vote for independence in a referendum.
June 3 » Mount Unzen erupts in Kyūshū, Japan, killing 43 people, all of them either researchers or journalists.
November 18 » After an 87-day siege, the Croatian city of Vukovar capitulates to the besieging Yugoslav People's Army and allied Serb paramilitary forces.
When copying data from this family tree, please include a reference to the origin: J. Ham, "Family tree Ham", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ham/I66724.php : accessed February 12, 2026), "Jantje van Oenen (1897-1991)".
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