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 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
November 1 » The first Library of Congress building opens its doors to the public; the library had previously been housed in the Congressional Reading Room in the U.S. Capitol.
December 30 » The British Colony of Natal annexes Zululand.
Day of marriage December 25, 1917
The temperature on December 25, 1917 was between -1.3 °C and 4.9 °C and averaged 1.0 °C. There was 2.2 mm of rain. There was 0.6 hours of sunshine (8%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the north-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.
April 12 » World War I: Canadian forces successfully complete the taking of Vimy Ridge from the Germans.
May 21 » The Imperial War Graves Commission is established through royal charter to mark, record, and maintain the graves and places of commemoration of the British Empire's military forces.
June 11 » King Alexander assumes the throne of Greece after his father, Constantine I, abdicates under pressure from allied armies occupying Athens.
October 31 » World War I: Battle of Beersheba: The "last successful cavalry charge in history".
November 8 » The first Council of People's Commissars is formed, including Vladimir Lenin, Leon Trotsky and Joseph Stalin.
December 15 » World War I: An armistice between Russia and the Central Powers is signed.
When copying data from this family tree, please include a reference to the origin: L. Vlastra, "Family tree Vlastra", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-vlastra/I74770.php : accessed May 21, 2024), "Bartholomeus Ouwerkerk (1897-????)".
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