January 13 » First Italo-Ethiopian War: the war's opening battle, the Battle of Coatit, occurs; it is an Italian victory.
March 22 » Before the Société pour L'Encouragement à l'Industrie, brothers Auguste and Louis Lumière demonstrate movie film technology publicly for the first time.
April 8 » In Pollock v. Farmers' Loan & Trust Co. the Supreme Court of the United States declares unapportioned income tax to be unconstitutional.
April 24 » Joshua Slocum, the first person to sail single-handedly around the world, sets sail from Boston, Massachusetts aboard the sloop "Spray".
May 7 » In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
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 November 13, 1918
The temperature on November 13, 1918 was between 0.7 °C and 8.5 °C and averaged 4.8 °C. There was 0.2 mm of rain. There was -0.1 hours of sunshine (0%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
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.
February 21 » The last Carolina parakeet dies in captivity at the Cincinnati Zoo.
March 16 » Finnish Civil War: Battle of Länkipohja is infamous for its bloody aftermath as the Whites executed 70–100 capitulated Reds.
August 27 » Mexican Revolution: Battle of Ambos Nogales: U.S. Army forces skirmish against Mexican Carrancistas in the only battle of World War I fought on American soil.
December 17 » Darwin Rebellion: Up to 1,000 demonstrators march on Government House in Darwin, Northern Territory, Australia.
December 27 » The Great Poland Uprising against the Germans begins.
Day of death May 9, 1955
The temperature on May 9, 1955 was between 8.7 °C and 18.1 °C and averaged 12.2 °C. There was 2.4 mm of rain during 1.6 hours. There was 5.9 hours of sunshine (38%). The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
May 18 » Operation Passage to Freedom, the evacuation of 310,000 Vietnamese civilians, soldiers and non-Vietnamese members of the French Army from communist North Vietnam to South Vietnam following the end of the First Indochina War, ends.
June 2 » The USSR and Yugoslavia sign the Belgrade declaration and thus normalize relations between both countries, discontinued since 1948.
June 16 » In a futile effort to topple Argentine President Juan Perón, rogue aircraft pilots of the Argentine Navy drop several bombs upon an unarmed crowd demonstrating in favor of Perón in Buenos Aires, killing 364 and injuring at least 800. At the same time on the ground, some soldiers attempt to stage a coup but are suppressed by loyal forces.
July 27 » The Austrian State Treaty restores Austrian sovereignty.
September 20 » The Treaty on Relations between the USSR and the GDR is signed.
October 29 » The Soviet battleshipNovorossiysk strikes a World War II mine in the harbor at Sevastopol.
Day of burial May 12, 1955
The temperature on May 12, 1955 was between 3.3 °C and 14.2 °C and averaged 9.2 °C. There was 5.6 hours of sunshine (36%). The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
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/I73702.php : accessed March 11, 2026), "Jan Ernst Onkenhout (1895-1955)".
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