The temperature on May 25, 1911 was between 11.3 °C and 22.0 °C and averaged 16.3 °C. There was 6.4 hours of sunshine (40%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
January 14 » Roald Amundsen's South Pole expedition makes landfall on the eastern edge of the Ross Ice Shelf.
March 29 » The M1911 .45 ACP pistol becomes the official U.S. Army side arm.
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 23 » The New York Public Library is dedicated.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
October 5 » The Kowloon–Canton Railway commences service.
When copying data from this family tree, please include a reference to the origin: J. Ackerman, "Family tree Ackerman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ackerman/I244.php : accessed February 18, 2026), "theresia sofia Ackerman (1911-)".
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