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 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
December 9 » Activist Marguerite Durand founds the feminist daily newspaper La Fronde in Paris.
Day of marriage December 29, 1926
The temperature on December 29, 1926 was between 3.6 °C and 8.1 °C and averaged 5.9 °C. There was 0.3 mm of rain. There was 0.7 hours of sunshine (9%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the northwest. Source: KNMI
April 6 » Varney Airlines makes its first commercial flight (Varney is the root company of United Airlines).
April 24 » The Treaty of Berlin is signed. Germany and the Soviet Union each pledge neutrality in the event of an attack on the other by a third party for the next five years.
May 9 » Admiral Richard E. Byrd and Floyd Bennett claim to have flown over the North Pole (later discovery of Byrd's diary appears to cast some doubt on the claim.)
May 12 » The Italian-built airship Norge becomes the first vessel to fly over the North Pole.
June 28 » Mercedes-Benz is formed by Gottlieb Daimler and Karl Benz merging their two companies.
October 14 » The children's book Winnie-the-Pooh, by A. A. Milne, is first published.
When copying data from this family tree, please include a reference to the origin: Patrick Jansen, "Family tree Jansen", database, Genealogy Online (https://www.genealogieonline.nl/jansen_stamboom/I138.php : accessed March 7, 2026), "Berendina Weldelina Maria van der Sluis (1897-????)".
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