The temperature on May 21, 1910 was between 13.4 °C and 27.7 °C and averaged 20.6 °C. There was 10.7 hours of sunshine (67%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
January 13 » The first public radio broadcast takes place; a live performance of the operas Cavalleria rusticana and Pagliacci are sent out over the airwaves from the Metropolitan Opera House in New York.
July 4 » The Johnson–Jeffries riots occur after African-American boxer Jack Johnson knocks out white boxer Jim Jeffries in the 15th round. Between 11 and 26 people are killed and hundreds more injured.
July 15 » In his book Clinical Psychiatry, Emil Kraepelin gives a name to Alzheimer's disease, naming it after his colleague Alois Alzheimer.
September 26 » Indian journalist Swadeshabhimani Ramakrishna Pillai is arrested after publishing criticism of the government of Travancore and is exiled.
November 20 » Mexican Revolution: Francisco I. Madero issues the Plan de San Luis Potosí, denouncing Mexican President Porfirio Díaz, calling for a revolution to overthrow the government of Mexico, effectively starting the Mexican Revolution.
December 21 » An underground explosion at the Hulton Bank Colliery No. 3 Pit in Over Hulton, Westhoughton, England, kills 344 miners.
When copying data from this family tree, please include a reference to the origin: Erik Develter, "Family tree Erik Develter", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-erik-develter/I1944982915998638.php : accessed May 11, 2025), "Joseph Henri Develter (1910-)".
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