The temperature on April 21, 1911 was between 1.3 °C and 15.1 °C and averaged 9.7 °C. There was 4.6 hours of sunshine (32%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
January 5 » Kappa Alpha Psi, the world's third oldest and largest black fraternity, is founded at Indiana University.
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 1 » Germany despatches the gunship SMSPanther to Morocco, sparking the Agadir Crisis.
September 24 » His Majesty's Airship No. 1, Britain's first rigid airship, is wrecked by strong winds before her maiden flight at Barrow-in-Furness.
November 19 » The Doom Bar in Cornwall claimed two ships, Island Maid and Angele, the latter killing the entire crew except the captain.
December 29 » Sun Yat-sen becomes the provisional President of the Republic of China; he formally takes office on January 1, 1912.
Day of marriage December 11, 1935
The temperature on December 11, 1935 was between 1.8 °C and 4.9 °C and averaged 3.4 °C. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
February 12 » USSMacon, one of the two largest helium-filled airships ever created, crashes into the Pacific Ocean off the coast of California and sinks.
February 26 » Robert Watson-Watt carries out a demonstration near Daventry which leads directly to the development of radar in the United Kingdom.
February 28 » DuPont scientist Wallace Carothers invents nylon.
April 14 » The Black Sunday dust storm, considered one of the worst storms of the Dust Bowl, swept across the Oklahoma and Texas panhandles and neighboring areas.
May 14 » The Constitution of the Philippines is ratified by a popular vote.
May 24 » The first night game in Major League Baseball history is played in Cincinnati, Ohio, with the Cincinnati Reds beating the Philadelphia Phillies 2–1 at Crosley Field.
When copying data from this family tree, please include a reference to the origin: W. Rovers, "Family tree Ro(o)vers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_rovers/I22490.php : accessed March 6, 2026), "Johanna Roovers (1911-)".
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