January 12 » The National Trust is founded in the United Kingdom.
February 1 » Fountains Valley, Pretoria, the oldest nature reserve in Africa, is proclaimed by President Paul Kruger.
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.
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
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 21, 1917
The temperature on November 21, 1917 was between 6.1 °C and 11.2 °C and averaged 9.2 °C. There was 13.8 mm of rain. The average windspeed was 4 Bft (moderate breeze) 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.
April 12 » World War I: Canadian forces successfully complete the taking of Vimy Ridge from the Germans.
June 13 » World War I: The deadliest German air raid on London of the war is carried out by Gotha G.IV bombers and results in 162 deaths, including 46 children, and 432 injuries.
June 28 » World War I: Greece joins the Allied powers.
July 12 » The Bisbee Deportation occurs as vigilantes kidnap and deport nearly 1,300 striking miners and others from Bisbee, Arizona.
September 14 » The Russian Empire is formally replaced by the Russian Republic.
December 9 » World War I: Field Marshal Allenby captures Jerusalem, Palestine.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I201931.php : accessed October 23, 2026), "Jakob Groenewold (1895-????)".
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