February 7 » Second Boer War: British troops fail in their third attempt to lift the Siege of Ladysmith.
February 27 » The British Labour Party is founded.
October 19 » Max Planck discovers Planck's law of black-body radiation.
November 7 » Second Boer War: Battle of Leliefontein, a battle during which the Royal Canadian Dragoons win three Victoria Crosses.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
December 18 » The Upper Ferntree Gully to Gembrook, Victoria Narrow-gauge (2ft 6 in or 762mm) Railway (now the Puffing Billy Railway) in Victoria, Australia is opened for traffic.
When copying data from this family tree, please include a reference to the origin: Ruud Heemskerk, "Heemskerk door de eeuwen heen", database, Genealogy Online (https://www.genealogieonline.nl/heemskerk-door-de-eeuwen-heen/R513.php : accessed May 5, 2025), "Adranus Alida Maria Heemskerk (1900-)".
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