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.
June 22 » British colonial officers Charles Walter Rand and Lt. Charles Egerton Ayerst are assassinated in Pune, Maharashtra, India by the Chapekar brothers and Mahadeo Vinayak Ranade, who are later caught and hanged.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
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 January 22, 1917
The temperature on January 22, 1917 was between -9.4 °C and -2.4 °C and averaged -6.8 °C. There was 7.1 hours of sunshine (83%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east. 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.
January 17 » The United States pays Denmark $25 million for the Virgin Islands.
February 24 » World War I: The U.S. ambassador Walter Hines Page to the United Kingdom is given the Zimmermann Telegram, in which Germany pledges to ensure the return of New Mexico, Texas, and Arizona to Mexico if Mexico declares war on the United States.
April 16 » Vladimir Lenin returns to Petrograd, Russia, from exile in Switzerland.
November 5 » Tikhon is elected the Patriarch of Moscow and of the Russian Orthodox Church.
December 6 » World War I: USSJacob Jones is the first American destroyer to be sunk by enemy action when it is torpedoed by German submarine SMU-53.
December 11 » World War I: British General Edmund Allenby enters Jerusalem on foot and declares martial law.
When copying data from this family tree, please include a reference to the origin: Eva Drenth, "Family tree Diverse", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-drenth/I17736.php : accessed January 29, 2026), "Helena Maria van Helden (1897-????)".
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