The temperature on April 13, 1886 was about 13.4 °C. The air pressure was 4 kgf/m2 and came mainly from the west. The airpressure was 77 cm mercury. The atmospheric humidity was 47%. Source: KNMI
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
May 4 » Haymarket affair: A bomb is thrown at policemen trying to break up a labor rally in Chicago, United States, killing eight and wounding 60. The police fire into the crowd.
June 26 » Henri Moissan isolated elemental Fluorine for the first time.
June 30 » The first transcontinental train trip across Canada departs from Montreal, Quebec. It arrives in Port Moody, British Columbia on July 4.
July 3 » The New-York Tribune becomes the first newspaper to use a linotype machine, eliminating typesetting by hand.
July 4 » The Canadian Pacific Railway's first scheduled train from Montreal arrives in Port Moody on the Pacific coast, after six days of travel.
November 30 » The Folies Bergère stages its first revue.
Day of death June 1, 1960
The temperature on June 1, 1960 was between 6.7 °C and 17.8 °C and averaged 12.9 °C. There was 13.8 hours of sunshine (84%). The almost cloudless was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
January 19 » Japan and the United States sign the US–Japan Mutual Security Treaty
May 22 » The Great Chilean earthquake, measuring 9.5 on the moment magnitude scale, hits southern Chile, becoming the most powerful earthquake ever recorded.
July 1 » Independence of Somalia.
August 12 » Echo 1A, NASA's first successful communications satellite, is launched.
November 4 » At the Kasakela Chimpanzee Community in Tanzania, Dr. Jane Goodall observes chimpanzees creating tools, the first-ever observation in non-human animals.
November 25 » The Mirabal sisters of the Dominican Republic are assassinated.
When copying data from this family tree, please include a reference to the origin: H. Rozenberg, "Family tree Rozenberg", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-rozenberg/I457.php : accessed February 14, 2026), "Henderikus de Groot (1886-1960)".
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