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.
May 26 » The original manuscript of William Bradford's history, "Of Plymouth Plantation" is returned to the Governor of Massachusetts by the Bishop of London after being taken during the American Revolutionary War.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
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 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).
Day of marriage June 23, 1926
The temperature on June 23, 1926 was between 6.3 °C and 16.5 °C and averaged 12.6 °C. There was 1.9 mm of rain. There was 7.7 hours of sunshine (46%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
March 16 » History of Rocketry: Robert Goddard launches the first liquid-fueled rocket, at Auburn, Massachusetts.
May 9 » Admiral Richard E. Byrd and Floyd Bennett claim to have flown over the North Pole (later discovery of Byrd's diary appears to cast some doubt on the claim.)
May 18 » Evangelist Aimee Semple McPherson disappears in Venice, California.
May 22 » Chiang Kai-shek replaces the communists in Kuomintang China.
June 28 » Mercedes-Benz is formed by Gottlieb Daimler and Karl Benz merging their two companies.
November 25 » The deadliest November tornado outbreak in U.S. history kills 76 people and injures more than 400.
Day of death December 7, 1955
The temperature on December 7, 1955 was between 7.7 °C and 10.4 °C and averaged 9.6 °C. There was 0.6 mm of rain during 0.9 hours. The partly or heavily clouded was. The average windspeed was 5 Bft (very strong wind) and was prevailing from the west-southwest. Source: KNMI
April 12 » The polio vaccine, developed by Dr. Jonas Salk, is declared safe and effective.
April 24 » The Bandung Conference ends: Twenty-nine non-aligned nations of Asia and Africa finish a meeting that condemns colonialism, racism, and the Cold War.
September 6 » Istanbul's Greek, Jewish, and Armenian minorities are the target of a government-sponsored pogrom; dozens are killed in ensuing riots.
September 16 » A Zulu-class submarine becomes the first to launch a ballistic missile.
October 1 » The Xinjiang Uyghur Autonomous Region is established.
December 5 » The American Federation of Labor and the Congress of Industrial Organizations merge and form the AFL–CIO.
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/I65159.php : accessed February 2, 2026), "Nicolaas Willem Optendrees (1897-1955)".
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