The temperature on June 22, 1911 was between 10.6 °C and 20.7 °C and averaged 15.1 °C. There was 0.8 mm of rain. There was 5.5 hours of sunshine (33%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
April 8 » Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.
May 21 » President of Mexico Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, concluding the initial phase of the Mexican Revolution.
May 31 » The RMS Titanic is launched in Belfast, Northern Ireland.
September 1 » The armored cruiser Georgios Averof is commissioned into the Greek Navy. It now serves as a museum ship.
October 13 » Prince Arthur, Duke of Connaught and Strathearn, becomes the first Governor General of Canada of royal descent.
When copying data from this family tree, please include a reference to the origin: Klaas Boerstra, "Family tree Boerstra", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-boerstra/I8701.php : accessed April 23, 2024), "Clasina Catharina de Zwart (1887-????)".
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