April 30 » Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
May 23 » American Civil War: Sergeant William Harvey Carney is awarded the Medal of Honor for his heroism in the Assault on the Battery Wagner in 1863.
July 29 » In Italy, King Umberto I of Italy is assassinated by the anarchist Gaetano Bresci.
August 3 » The Firestone Tire and Rubber Company is founded.
October 9 » The Cook Islands become a territory of the United Kingdom.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of marriage March 31, 1930
The temperature on March 31, 1930 was between 3.0 °C and 16.4 °C and averaged 9.9 °C. There was 5.7 hours of sunshine (44%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 16 » The Romanian Football Federation joins FIFA.
February 18 » While studying photographs taken in January, Clyde Tombaugh discovers Pluto.
March 6 » International Unemployment Day demonstrations globally initiated by the Comintern.
March 12 » Mahatma Gandhi begins the Salt March, a 200-mile march to the sea to protest the British monopoly on salt in India.
May 1 » "Pluto" is officially proposed for the name of the newly-discovered dwarf planet Pluto by Vesto Slipher in the Lowell Observatory Observation Circular. The name quickly catches on.
May 27 » The 1,046 feet (319m) Chrysler Building in New York City, the tallest man-made structure at the time, opens to the public.
Day of death August 3, 1970
The temperature on August 3, 1970 was between 16.2 °C and 26.8 °C and averaged 21.4 °C. There was 8.8 hours of sunshine (57%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
January 22 » The Boeing 747, the world's first "jumbo jet", enters commercial service for launch customer Pan American Airways with its maiden voyage from John F. Kennedy International Airport to London Heathrow Airport.
April 22 » The first Earth Day is celebrated.
April 28 » Vietnam War: U.S. President Richard Nixon formally authorizes American combat troops to take part in the Cambodian campaign.
July 3 » The Troubles: The "Falls Curfew" begins in Belfast, Northern Ireland.
July 8 » Richard Nixon delivers a special congressional message enunciating Native American self-determination as official US Indian policy, leading to the Indian Self-Determination and Education Assistance Act of 1975.
November 12 » The 1970 Bhola cyclone makes landfall on the coast of East Pakistan becoming the deadliest tropical cyclone in history.
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/I16550.php : accessed February 4, 2026), "Adrianus Marinus Colpa (1900-1970)".
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