The temperature on August 17, 1911 was between 9.8 °C and 21.0 °C and averaged 15.3 °C. There was 4.6 hours of sunshine (31%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
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.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
September 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
October 9 » An accidental bomb explosion triggers the Wuchang Uprising against the Chinese monarchy.
November 3 » Chevrolet officially enters the automobile market in competition with the Ford Model T.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
When copying data from this family tree, please include a reference to the origin: Jaap van Tuyll, "Descendants Wolf", database, Genealogy Online (https://www.genealogieonline.nl/parenteel-wolf/I125496.php : accessed February 4, 2026), "Henricus Adrianus van Bers (1911-1911)".
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