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.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
June 22 » British colonial officers Charles Walter Rand and Lt. Charles Egerton Ayerst are assassinated in Pune, Maharashtra, India by the Chapekar brothers and Mahadeo Vinayak Ranade, who are later caught and hanged.
July 26 » Anglo-Afghan War: The Pashtun fakir Saidullah leads an army of more than 10,000 to begin a siege of the British garrison in the Malakand Agency of the North West Frontier Province of India.
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
Day of marriage March 12, 1921
The temperature on March 12, 1921 was between 2.9 °C and 16.4 °C and averaged 9.0 °C. There was 9.2 hours of sunshine (79%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
March 1 » The Australian cricket team captained by Warwick Armstrong becomes the first team to complete a whitewash of The Ashes, something that would not be repeated for 86 years.
May 19 » The United States Congress passes the Emergency Quota Act establishing national quotas on immigration.
June 12 » Mikhail Tukhachevsky orders the use of chemical weapons against the Tambov Rebellion, bringing an end to the peasant uprising.
June 28 » Serbian King Alexander I proclaims the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.
July 11 » A truce in the Irish War of Independence comes into effect.
October 29 » The Harvard University football team loses to Centre College, ending a 25-game winning streak. This is considered one of the biggest upsets in college football.
Day of death April 1, 1963
The temperature on April 1, 1963 was between 1.5 °C and 2.6 °C and averaged 2.0 °C. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
August 8 » Great Train Robbery: In England, a gang of 15 train robbers steal £2.6million in bank notes.
August 8 » The Zimbabwe African National Union (ZANU), the current ruling party of Zimbabwe, is formed by a split from the Zimbabwe African People's Union.
August 30 » The Moscow–Washington hotline between the leaders of the U.S. and the Soviet Union goes into operation.
September 4 » Swissair Flight 306 crashes near Dürrenäsch, Switzerland, killing all 80 people on board.
October 22 » A BAC One-Eleven prototype airliner crashes in UK with the loss of all on board.
December 22 » The cruise ship Lakonia burns 180 miles (290km) north of Madeira, Portugal with the loss of 128 lives.
When copying data from this family tree, please include a reference to the origin: J. Ham, "Family tree Ham", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-ham/I1387.php : accessed January 22, 2026), "Everdina Johanna Witteveen (1897-1963)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.