The temperature on December 23, 1911 was between 1.3 °C and 8.1 °C and averaged 4.3 °C. There was 0.8 mm of rain. There was 3.9 hours of sunshine (51%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
September 25 » An explosion of badly degraded propellant charges on board the French battleship Liberté detonates the forward ammunition magazines and destroys the ship.
November 3 » Chevrolet officially enters the automobile market in competition with the Ford Model T.
December 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
December 29 » Sun Yat-sen becomes the provisional President of the Republic of China; he formally takes office on January 1, 1912.
When copying data from this family tree, please include a reference to the origin: J.A.de Keijzer, "Family tree Tonnaer en Gerardu", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_tonnaer_gerardu/I1736.php : accessed September 27, 2024), "Johannes Swaen (1911-)".
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