The temperature on September 6, 1911 was between 10.4 °C and 24.1 °C and averaged 16.6 °C. There was 10.3 hours of sunshine (77%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. Source: KNMI
January 5 » Kappa Alpha Psi, the world's third oldest and largest black fraternity, is founded at Indiana University.
January 12 » The University of the Philippines College of Law is formally established; three future Philippine presidents are among the first enrollees.
May 9 » The works of Gabriele D'Annunzio are placed in the Index of Forbidden Books by the Vatican.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
November 1 » World's first combat aerial bombing mission takes place in Libya during the Italo-Turkish War. Second Lieutenant Giulio Gavotti of Italy drops several small bombs.
November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.
Day of death October 18, 1911
The temperature on October 18, 1911 was between 1.3 °C and 15.7 °C and averaged 7.5 °C. There was 8.3 hours of sunshine (79%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
January 30 » The destroyer USSTerry makes the first airplane rescue at sea saving the life of Douglas McCurdy ten miles from Havana, Cuba.
May 15 » More than 300 Chinese immigrants are killed in the Torreón massacre when the forces of the Mexican Revolution led by Emilio Madero take the city of Torreón from the Federales.
May 30 » At the Indianapolis Motor Speedway, the first Indianapolis 500 ends with Ray Harroun in his Marmon Wasp becoming the first winner of the 500-mile auto race.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
August 24 » Manuel de Arriaga is elected and sworn-in as the first President of Portugal.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I4375.php : accessed January 18, 2026), "Helena Elisabeth Maria Antonia Keijsper (1911-1911)".
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