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.
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
December 9 » Activist Marguerite Durand founds the feminist daily newspaper La Fronde in Paris.
December 30 » The British Colony of Natal annexes Zululand.
Day of marriage May 17, 1923
The temperature on May 17, 1923 was between 3.0 °C and 10.3 °C and averaged 6.0 °C. There was 8.6 mm of rain. There was 5.4 hours of sunshine (34%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 11 » Occupation of the Ruhr: Troops from France and Belgium occupy the Ruhr area to force Germany to make its World War I reparation payments.
April 15 » Insulin becomes generally available for use by people with diabetes.
July 24 » The Treaty of Lausanne, settling the boundaries of modern Turkey, is signed in Switzerland by Greece, Bulgaria and other countries that fought in World War I.
September 1 » The Great Kantō earthquake devastates Tokyo and Yokohama, killing about 105,000 people.
September 8 » Honda Point disaster: Nine US Navy destroyers run aground off the California coast. Seven are lost, and twenty-three sailors killed.
September 29 » The British Mandate for Palestine takes effect, creating Mandatory Palestine.
Day of death February 28, 1981
The average temperature on February 28, 1981 was 1.4 °C. There was 8.6 mm of rain during 7.7 hours. The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
January 17 » President of the Philippines Ferdinand Marcos lifts martial law eight years and five months after declaring it.
April 27 » Xerox PARC introduces the computer mouse.
August 1 » MTV begins broadcasting in the United States and airs its first video, "Video Killed the Radio Star" by The Buggles.
October 21 » Andreas Papandreou becomes Prime Minister of Greece, ending an almost 50-year-long system of power dominated by conservative forces.
December 13 » General Wojciech Jaruzelski declares martial law in Poland, largely due to the actions by Solidarity.
December 15 » A suicide car bombing targeting the Iraqi embassy in Beirut, Lebanon, levels the embassy and kills 61 people, including Iraq's ambassador to Lebanon. The attack is considered the first modern suicide bombing.
When copying data from this family tree, please include a reference to the origin: A.R. Hamstra, "Family tree Hamstra - Spanjer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-hamstra-spanjer/R159.php : accessed December 30, 2025), "gerrit Hamstra (1897-1981)".
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