The temperature on July 31, 1910 was between 14.9 °C and 22.1 °C and averaged 17.5 °C. There was 3.9 mm of rain. There was 3.1 hours of sunshine (20%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. Source: KNMI
January 15 » Construction ends on the Buffalo Bill Dam in Wyoming, United States, which was the highest dam in the world at the time, at 325ft (99m).
April 12 » SMSZrínyi, one of the last pre-dreadnought battleships built by the Austro-Hungarian Navy, is launched.
May 4 » The Royal Canadian Navy is created.
July 16 » John Robertson Duigan makes the first flight of the Duigan pusher biplane, the first aircraft built in Australia.
November 21 » Sailors on board Brazil's warships including the Minas Gerais, São Paulo, and Bahia, violently rebel in what is now known as the Revolta da Chibata (Revolt of the Lash).
December 21 » An underground explosion at the Hulton Bank Colliery No. 3 Pit in Over Hulton, Westhoughton, England, kills 344 miners.
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/I118530.php : accessed December 28, 2025), "Janna Helder (1910-)".
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