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 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.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
November 1 » The first Library of Congress building opens its doors to the public; the library had previously been housed in the Congressional Reading Room in the U.S. Capitol.
Day of marriage June 6, 1934
The temperature on June 6, 1934 was between 5.7 °C and 14.0 °C and averaged 10.2 °C. There was 6.6 mm of rain during 2.5 hours. There was 2.9 hours of sunshine (18%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
January 1 » A "Law for the Prevention of Genetically Diseased Offspring" comes into effect in Nazi Germany.
May 15 » Kārlis Ulmanis establishes an authoritarian government in Latvia.
July 25 » The Nazis assassinate Austrian Chancellor Engelbert Dollfuss in a failed coup attempt.
September 1 » The first Metro-Goldwyn-Mayer animated cartoon, The Discontented Canary, is released to movie theatres.
October 9 » An Ustashe assassin kills King Alexander I of Yugoslavia and Louis Barthou, Foreign Minister of France, in Marseille.
December 11 » Bill Wilson, co-founder of Alcoholics Anonymous, takes his last drink and enters treatment for the final time.
Day of death June 29, 1964
The temperature on June 29, 1964 was between 8.4 °C and 16.5 °C and averaged 13.5 °C. There was 0.3 mm of rain during 0.4 hours. There was 6.8 hours of sunshine (41%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
January 11 » Surgeon General of the United States Dr. Luther Terry, M.D., publishes the landmark report Smoking and Health: Report of the Advisory Committee to the Surgeon General of the United States saying that smoking may be hazardous to health, sparking national and worldwide anti-smoking efforts.
February 17 » In Wesberry v. Sanders the Supreme Court of the United States rules that congressional districts have to be approximately equal in population.
May 9 » Ngô Đình Cẩn, de facto ruler of central Vietnam under his brother President Ngô Đình Diệm before the family's toppling, is executed.
June 21 » Three civil rights workers, Andrew Goodman, James Chaney and Michael Schwerner, are murdered in Neshoba County, Mississippi, United States, by members of the Ku Klux Klan.
September 25 » The Mozambican War of Independence against Portugal begins.
October 16 » China detonates its first nuclear weapon.
When copying data from this family tree, please include a reference to the origin: R.A.Hemerik, "Descendants Hemerik-Broekhuizen-Huner-Koper-Barink", database, Genealogy Online (https://www.genealogieonline.nl/parenteel-hemerik/I126604.php : accessed February 18, 2026), "Jacobus Groeneveld (1897-1964)".
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