May 7 » In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
May 25 » The Republic of Formosa is formed, with Tang Jingsong as its president.
June 27 » The inaugural run of the Baltimore and Ohio Railroad's Royal Blue from Washington, D.C., to New York City, the first U.S. passenger train to use electric locomotives.
September 18 » The Atlanta Exposition Speech on race relations is delivered by Booker T. Washington.
October 4 » Horace Rawlins wins the first U.S. Open Men's Golf Championship.
Day of marriage May 1, 1919
The temperature on May 1, 1919 was between 3.9 °C and 9.4 °C and averaged 6.5 °C. There was 4.1 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. 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 » March 1st Movement begins in Korea under Japanese rule.
March 2 » The first Communist International meets in Moscow.
July 21 » The dirigible Wingfoot Air Express crashes into the Illinois Trust and Savings Building in Chicago, killing 12 people.
October 7 » KLM, the flag carrier of the Netherlands, is founded. It is the oldest airline still operating under its original name.
November 28 » Lady Astor is elected as a Member of the Parliament of the United Kingdom. She is the first woman to sit in the House of Commons. (Countess Markievicz, the first to be elected, refused to sit.)
December 17 » Uruguay becomes a signatory to the Buenos Aires copyright treaty.
Day of death September 2, 1966
The temperature on September 2, 1966 was between 15.1 °C and 20.0 °C and averaged 17.0 °C. There was 2.3 mm of rain during 2.4 hours. There was 5.0 hours of sunshine (37%). The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
February 28 » A NASA T-38 Talon crashes into the McDonnell Aircraft factory while attempting a poor-visibility landing at Lambert Field, St. Louis, killing astronauts Elliot See and Charles Bassett.
March 1 » The Ba'ath Party takes power in Syria.
March 17 » Off the coast of Spain in the Mediterranean, the DSVAlvin submarine finds a missing American hydrogen bomb.
April 30 » The Church of Satan is formed in The Black House, San Francisco.
May 25 » Explorer program: Explorer 32 launches.
July 24 » Michael Pelkey makes the first BASE jump from El Capitan along with Brian Schubert. Both came out with broken bones. BASE jumping has now been banned from El Cap.
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/I60735.php : accessed February 27, 2026), "Pieter Keizer (1895-1966)".
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