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 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
Day of marriage September 20, 1924
The temperature on September 20, 1924 was between 12.1 °C and 19.1 °C and averaged 16.3 °C. There was 1.0 hours of sunshine (8%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 5 » The Royal Greenwich Observatory begins broadcasting the hourly time signals known as the Greenwich Time Signal.
May 10 » J. Edgar Hoover is appointed first Director of the United States' Federal Bureau of Investigation (FBI), and remains so until his death in 1972.
May 21 » University of Chicago students Richard Loeb and Nathan Leopold, Jr. murder 14-year-old Bobby Franks in a "thrill killing".
September 9 » Hanapepe massacre occurs on Kauai, Hawaii.
November 23 » Edwin Hubble's discovery, that the Andromeda "nebula" is actually another island galaxy far outside of our own Milky Way, is first published in The New York Times.
December 1 » The National Hockey League's first United States-based franchise, the Boston Bruins, played their first game in league play at home, at the still-extant Boston Arena indoor hockey facility.
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/I108874.php : accessed December 29, 2025), "Repke Wagenaar (1897-????)".
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