The temperature on January 25, 1911 was between 4.1 °C and 7.3 °C and averaged 5.5 °C. There was 0.4 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
March 25 » In New York City, the Triangle Shirtwaist Factory fire kills 146 garment workers.
March 29 » The M1911 .45 ACP pistol becomes the official U.S. Army side arm.
May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
October 5 » The Kowloon–Canton Railway commences service.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
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.
Day of death April 24, 1911
The temperature on April 24, 1911 was between 7.3 °C and 14.1 °C and averaged 10.4 °C. There was 10.1 hours of sunshine (70%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
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 22 » Mexican Revolution: Government forces bring an end to the Magonista rebellion of 1911 in the Second Battle of Tijuana.
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.
August 29 » The Canadian Naval Service becomes the Royal Canadian Navy.
When copying data from this family tree, please include a reference to the origin: Gerard Mutter, "Family tree De Duffelt", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-duffelt/I246734.php : accessed February 14, 2026), "Maria Hendrika "1911 +" Roelofs (1911-1911)".
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