The temperature on August 21, 1911 was between 13.0 °C and 22.2 °C and averaged 16.3 °C. There was 1.5 mm of rain. There was 2.3 hours of sunshine (16%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
March 25 » In New York City, the Triangle Shirtwaist Factory fire kills 146 garment workers.
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.
August 1 » Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate.
September 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I374506.php : accessed February 1, 2026), "Arnoldus van der Wijst (1868-1911)".
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