The temperature on March 11, 1910 was between 6.2 °C and 9.1 °C and averaged 7.0 °C. There was 7.4 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
March 1 » The deadliest avalanche in United States history buries a Great Northern Railway train in northeastern King County, Washington, killing 96 people.
August 29 » The Japan–Korea Treaty of 1910, also known as the Japan–Korea Annexation Treaty, becomes effective, officially starting the period of Japanese rule in Korea.
September 20 » The ocean liner SSFrance, later known as the "Versailles of the Atlantic", is launched.
October 14 » English aviator Claude Grahame-White lands his aircraft on Executive Avenue near the White House in Washington, D.C.
October 20 » The hull of the RMSOlympic, sister-ship to the ill-fated RMS Titanic, is launched from the Harland and Wolff shipyard in Belfast.
November 20 » Mexican Revolution: Francisco I. Madero issues the Plan de San Luis Potosí, denouncing Mexican President Porfirio Díaz, calling for a revolution to overthrow the government of Mexico, effectively starting the Mexican Revolution.
Day of death April 24, 1954
The temperature on April 24, 1954 was between 0.2 °C and 12.4 °C and averaged 6.8 °C. There was 0.1 mm of rain. There was 13.0 hours of sunshine (90%). The almost cloudless was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
March 13 » The Battle of Điện Biên Phủ begins with an artillery barrage by Viet Minh forces under Võ Nguyên Giáp; Viet Minh victory lead to the end of the First Indochina War and French withdrawal from Vietnam.
March 26 » Nuclear weapons testing: The Romeo shot of Operation Castle is detonated at Bikini Atoll. Yield: 11 megatons.
July 20 » Germany: Otto John, head of West Germany's secret service, defects to East Germany.
July 21 » First Indochina War: The Geneva Conference partitions Vietnam into North Vietnam and South Vietnam.
August 24 » Getúlio Vargas, president of Brazil, commits suicide and is succeeded by João Café Filho.
November 1 » The Front de Libération Nationale fires the first shots of the Algerian War of Independence.
When copying data from this family tree, please include a reference to the origin: A. Koolmees, "Family tree Koolmees", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koolmees/I569.php : accessed February 19, 2026), "Helena Maria Koolmees (1910-1954)".
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