The temperature on April 30, 1904 was between 9.5 °C and 13.3 °C and averaged 11.1 °C. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
January 17 » Anton Chekhov's The Cherry Orchard receives its premiere performance at the Moscow Art Theatre.
February 7 » A fire begins in Baltimore, Maryland; it destroys over 1,500 buildings in 30 hours.
April 30 » The Louisiana Purchase Exposition World's Fair opens in St. Louis, Missouri.
October 4 » The IFK Göteborg football club is founded in Sweden.
October 27 » The first underground New York City Subway line opens, later designated as the IRT Broadway–Seventh Avenue Line.
December 7 » Comparative fuel trials begin between warships HMSSpiteful and HMSPeterel: Spiteful was the first warship powered solely by fuel oil, and the trials led to the obsolescence of coal in ships of the Royal Navy.
Day of death February 7, 1947
The temperature on February 7, 1947 was between -12.2 °C and -4.5 °C and averaged -8.5 °C. There was 7.3 hours of sunshine (77%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
January 22 » KTLA, the first commercial television station west of the Mississippi River, begins operation in Hollywood.
February 21 » In New York City, Edwin Land demonstrates the first "instant camera", the Polaroid Land Camera, to a meeting of the Optical Society of America.
March 17 » First flight of the B-45 Tornado strategic bomber.
April 15 » Jackie Robinson debuts for the Brooklyn Dodgers, breaking baseball's color line.
July 26 » Cold War: U.S. President Harry S. Truman signs the National Security Act of 1947 into United States law creating the Central Intelligence Agency, United States Department of Defense, United States Air Force, Joint Chiefs of Staff, and the United States National Security Council.
December 23 » The transistor is first demonstrated at Bell Laboratories.
When copying data from this family tree, please include a reference to the origin: Peeters Mathieu, "FutureHistory", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-riske/I4965.php : accessed October 10, 2026), "Helena Maria de Bock (1904-1947)".
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