February 23 » Second Boer War: During the Battle of the Tugela Heights, the first British attempt to take Hart's Hill fails.
February 28 » The Second Boer War: The 118-day "Siege of Ladysmith" is lifted.
May 29 » N'Djamena is founded as Fort-Lamy by the French commander Émile Gentil.
June 14 » The second German Naval Law calls for the Imperial German Navy to be doubled in size, resulting in an Anglo-German naval arms race.
June 25 » The Taoist monk Wang Yuanlu discovers the Dunhuang manuscripts, a cache of ancient texts that are of great historical and religious significance, in the Mogao Caves of Dunhuang, China.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of death December 12, 1969
The average temperature on December 12, 1969 was -2.4 °C. The almost completely overcast was. The average windspeed was 1 Bft (weak wind) and was prevailing from the east-southeast. Source: KNMI
January 16 » Czech student Jan Palach commits suicide by self-immolation in Prague, Czechoslovakia, in protest against the Soviets' crushing of the Prague Spring the year before.
January 18 » United Airlines Flight 266 crashes into Santa Monica Bay killing all 32 passengers and six crew members.
May 2 » The British ocean liner Queen Elizabeth 2 departs on her maiden voyage to New York City.
June 22 » The Cuyahoga River catches fire in Cleveland, Ohio, drawing national attention to water pollution, and spurring the passing of the Clean Water Act and the creation of the Environmental Protection Agency.
August 9 » Followers of Charles Manson murder pregnant actress Sharon Tate (wife of Roman Polanski), coffee heiress Abigail Folger, Polish actor Wojciech Frykowski, men's hairstylist Jay Sebring and recent high-school graduate Steven Parent.
December 17 » Project Blue Book: The United States Air Force closes its study of UFOs.
When copying data from this family tree, please include a reference to the origin: Alle Elbers, "Sluzigers (e.a.)", database, Genealogy Online (https://www.genealogieonline.nl/sluzigers/I138044.php : accessed December 27, 2025), "Jacob Los (1900-1969)".
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