January 28 » The Carnegie Institution of Washington is founded in Washington, D.C. with a $10 million gift from Andrew Carnegie.
March 7 » Second Boer War: Boers, led by Koos de la Rey, inflict the biggest defeat upon the British since the beginning of the war, at Tweebosch.
May 17 » Greek archaeologist Valerios Stais discovers the Antikythera mechanism, an ancient mechanical analog computer.
May 31 » Second Boer War: The Treaty of Vereeniging ends the war and ensures British control of South Africa.
July 17 » Willis Carrier creates the first air conditioner in Buffalo, New York.
December 28 » The Syracuse Athletic Club defeated the New York Philadelphians, 5–0, in the first indoor professional football game, which was held at Madison Square Garden.
Day of death May 23, 1926
The temperature on May 23, 1926 was between 7.5 °C and 12.7 °C and averaged 10.1 °C. There was 0.6 hours of sunshine (4%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
March 16 » History of Rocketry: Robert Goddard launches the first liquid-fueled rocket, at Auburn, Massachusetts.
May 22 » Chiang Kai-shek replaces the communists in Kuomintang China.
May 25 » Sholom Schwartzbard assassinates Symon Petliura, the head of the government of the Ukrainian People's Republic, which is in government-in-exile in Paris.
June 14 » Brazil leaves the League of Nations.
September 25 » The international Convention to Suppress the Slave Trade and Slavery is first signed.
December 17 » Antanas Smetona assumes power in Lithuania as the 1926 coup d'état is successful.
When copying data from this family tree, please include a reference to the origin: Peeters Mathieu, "FutureHistory", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-riske/I29520.php : accessed October 13, 2026), "Henri Juliaan de Roeck (1902-1926)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.