April 2 » "Electric Theatre", the first full-time movie theater in the United States, opens in Los Angeles.
April 2 » Dmitry Sipyagin, Minister of Interior of the Russian Empire, is assassinated in the Marie Palace, Saint Petersburg.
April 14 » James Cash Penney opens his first store in Kemmerer, Wyoming.
May 20 » Cuba gains independence from the United States. Tomás Estrada Palma becomes the country's first President.
July 17 » Willis Carrier creates the first air conditioner in Buffalo, New York.
Day of marriage December 18, 1926
The temperature on December 18, 1926 was between 2.9 °C and 6.9 °C and averaged 4.9 °C. There was 5.5 mm of rain. There was 0.5 hours of sunshine (6%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the northwest. Source: KNMI
March 14 » The El Virilla train accident, Costa Rica, kills 248 people and wounds another 93 when a train falls off a bridge over the Río Virilla between Heredia and Tibás.
March 16 » History of Rocketry: Robert Goddard launches the first liquid-fueled rocket, at Auburn, Massachusetts.
April 21 » Al-Baqi cemetery, former site of the mausoleum of four Shi'a Imams, is leveled to the ground by Wahhabis.
April 24 » The Treaty of Berlin is signed. Germany and the Soviet Union each pledge neutrality in the event of an attack on the other by a third party for the next five years.
August 5 » Harry Houdini performs his greatest feat, spending 91 minutes underwater in a sealed tank before escaping.
August 6 » Gertrude Ederle becomes the first woman to swim across the English Channel.
Day of death July 12, 1965
The temperature on July 12, 1965 was between 15.4 °C and 18.3 °C and averaged 16.4 °C. There was 14.3 mm of rain during 13.4 hours. The almost completely overcast was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
February 21 » Malcolm X is assassinated while giving a talk at the Audubon Ballroom in Harlem.
March 19 » The wreck of the SSGeorgiana, valued at over $50,000,000 and said to have been the most powerful Confederate cruiser, is discovered by teenage diver and pioneer underwater archaeologist E. Lee Spence, exactly 102 years after its destruction.
March 25 » Civil rights activists led by Martin Luther King Jr. successfully complete their 4-day 50-mile march from Selma to the capitol in Montgomery, Alabama.
June 22 » The Treaty on Basic Relations between Japan and the Republic of Korea is signed.
November 28 » Vietnam War: In response to U.S. President Lyndon B. Johnson's call for "more flags" in Vietnam, Philippine President-elect Ferdinand Marcos announces he will send troops to help fight in South Vietnam.
December 4 » The Grateful Dead's first concert performance under this new name.
When copying data from this family tree, please include a reference to the origin: Jan Kaper, "Family tree Kaper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kaper/I67792.php : accessed March 6, 2026), "Roelofje Koopmans (1902-1965)".
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