March 1 » Henri Becquerel discovers radioactive decay.
March 2 » The Battle of Adwa: The Italian Army defeated by the Ethiopian Army in Adwa, Tigray, Ethiopia.
May 18 » The United States Supreme Court rules in Plessy v. Ferguson that the "separate but equal" doctrine is constitutional.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
July 28 » The city of Miami, Florida is incorporated.
August 17 » Bridget Driscoll became the first recorded case of a pedestrian killed in a collision with a motor car in the United Kingdom.
Day of death May 9, 1955
The temperature on May 9, 1955 was between 8.7 °C and 18.1 °C and averaged 12.2 °C. There was 2.4 mm of rain during 1.6 hours. There was 5.9 hours of sunshine (38%). The partly or heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
June 14 » Chile becomes a signatory to the Buenos Aires copyright treaty.
September 16 » A Zulu-class submarine becomes the first to launch a ballistic missile.
September 16 » The military coup to unseat President Juan Perón of Argentina is launched at midnight.
October 26 » After the last Allied troops have left the country, and following the provisions of the Austrian Independence Treaty, Austria declares that it will never join a military alliance.
November 1 » The Vietnam War begins.
December 8 » The Flag of Europe is adopted by Council of Europe.
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/I1382.php : accessed January 21, 2026), "Leendert Arnold (1896-1955)".
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