May 17 » The children's novel The Wonderful Wizard of Oz, by L. Frank Baum, is first published in the United States. The first copy is given to the author's sister.
May 23 » American Civil War: Sergeant William Harvey Carney is awarded the Medal of Honor for his heroism in the Assault on the Battery Wagner in 1863.
June 5 » Second Boer War: British soldiers take Pretoria.
October 9 » The Cook Islands become a territory of the United Kingdom.
October 19 » Max Planck discovers Planck's law of black-body radiation.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death April 29, 1949
The temperature on April 29, 1949 was between 2.3 °C and 11.2 °C and averaged 8.1 °C. There was 7.9 mm of rain during 11.6 hours. There was 3.7 hours of sunshine (25%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
January 31 » These Are My Children, the first television daytime soap opera, is broadcast by the NBC station in Chicago.
April 1 » The Government of Canada repeals Japanese-Canadian internment after seven years.
April 4 » Cold War: Twelve nations sign the North Atlantic Treaty creating the North Atlantic Treaty Organization.
May 23 » Cold War: The Western occupying powers approve the Basic Law and establish a new German state, the Federal Republic of Germany.
June 8 » Helen Keller, Dorothy Parker, Danny Kaye, Fredric March, John Garfield, Paul Muni and Edward G. Robinson are named in an FBI report as Communist Party members.
June 19 » The first ever NASCAR race was held at Charlotte Speedway, where Jim Roper would win the inaugural event.
When copying data from this family tree, please include a reference to the origin: Peter J van Oss, "Van Oss tree", database, Genealogy Online (https://www.genealogieonline.nl/van-oss-tree/I0388.php : accessed January 3, 2026), "Martinus Petrus Hoefnagel (1900-1949)".
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