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.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
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.
September 11 » After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
Day of marriage April 1, 1920
The temperature on April 1, 1920 was between 3.4 °C and 11.7 °C and averaged 7.7 °C. There was 3.1 mm of rain. There was 1.2 hours of sunshine (9%). 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.
January 16 » The League of Nations holds its first council meeting in Paris, France.
February 20 » An earthquake kills between 114 and 130 in Georgia and heavily damages the town of Gori.
March 19 » The United States Senate rejects the Treaty of Versailles for the second time (the first time was on November 19, 1919).
April 25 » At the San Remo conference, the principal Allied Powers of World War I adopt a resolution to determine the allocation of Class "A" League of Nations mandates for administration of the former Ottoman-ruled lands of the Middle East.
May 3 » A Bolshevik coup fails in the Democratic Republic of Georgia.
December 19 » King Constantine I is restored as King of the Hellenes after the death of his son Alexander of Greece and a plebiscite.
Day of death April 16, 1971
The temperature on April 16, 1971 was between 4.4 °C and 9.2 °C and averaged 6.9 °C. There was 6.4 mm of rain during 3.2 hours. The almost completely overcast was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 21 » The current Emley Moor transmitting station, the tallest free-standing structure in the United Kingdom, begins transmitting UHF broadcasts.
February 3 » New York Police Officer Frank Serpico is shot during a drug bust in Brooklyn and survives to later testify against police corruption.
February 8 » South Vietnamese ground troops launch an incursion into Laos to try to cut off the Ho Chi Minh trail and stop communist infiltration.
May 19 » Mars probe program: Mars 2 is launched by the Soviet Union.
August 1 » The Concert for Bangladesh, organized by former Beatle George Harrison, is held at Madison Square Garden in New York City.
November 30 » Iran seizes the Greater and Lesser Tunbs from the Emirates of Sharjah and Ras Al Khaimah.
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/I199692.php : accessed December 30, 2025), "Dirk Hendrik Roemers (1897-1971)".
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