The temperature on June 30, 1911 was between 11.3 °C and 15.8 °C and averaged 13.7 °C. There was 6.1 mm of rain. There was -0.1 hours of sunshine (0%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
November 1 » World's first combat aerial bombing mission takes place in Libya during the Italo-Turkish War. Second Lieutenant Giulio Gavotti of Italy drops several small bombs.
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: A.G. Eijssink, "Family tree Eijssink", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijssink/I9362.php : accessed February 25, 2026), "Petrus de Haas (1911-)".
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