April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
Day of death February 12, 1975
The temperature on February 12, 1975 was between 4.3 °C and 9.2 °C and averaged 6.4 °C. There was 0.5 mm of rain during 0.7 hours. The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
January 8 » Ella T. Grasso becomes Governor of Connecticut, the first woman to serve as a Governor in the United States other than by succeeding her husband.
February 5 » Riots break in Lima, Peru after the police forces go on strike the day before. The uprising (locally known as the Limazo) is bloodily suppressed by the military dictatorship.
April 13 » An attack by the Phalangist resistance kills 26 militia members of the Popular Front for the Liberation of Palestine, marking the start of the 15-year Lebanese Civil War.
June 29 » Steve Wozniak tested his first prototype of Apple I computer.
August 20 » Viking program: NASA launches the Viking 1 planetary probe toward Mars.
September 16 » Papua New Guinea gains independence from Australia.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I81719.php : accessed December 29, 2025), "Hendrik Kamp (1897-1975)".
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