The temperature on May 7, 1887 was about 9.1 °C. The air pressure was 10 kgf/m2 and came mainly from the south-southwest. The airpressure was 76 cm mercury. The atmospheric humidity was 92%. 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.
January 20 » The United States Senate allows the Navy to lease Pearl Harbor as a naval base.
February 8 » The Dawes Act authorizes the President of the United States to survey Native American tribal land and divide it into individual allotments.
June 18 » The Reinsurance Treaty between Germany and Russia is signed.
July 6 » David Kalākaua, monarch of the Kingdom of Hawaii, is forced to sign the Bayonet Constitution, which transfers much of the king's authority to the Legislature of the Kingdom of Hawaii.
October 1 » Balochistan is conquered by the British Empire.
November 13 » Bloody Sunday clashes in central London.
Day of marriage August 17, 1916
The temperature on August 17, 1916 was between 11.0 °C and 22.5 °C and averaged 16.3 °C. There was 0.5 mm of rain. There was 6.7 hours of sunshine (46%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
February 29 » Child labor: In South Carolina, the minimum working age for factory, mill, and mine workers is raised from 12 to 14 years old.
April 20 » The Chicago Cubs play their first game at Weeghman Park (currently Wrigley Field), defeating the Cincinnati Reds 7–6 in 11 innings.
August 27 » World War I: The Kingdom of Romania declares war on Austria-Hungary, entering the war as one of the Allied nations.
August 28 » World War I: Italy declares war on Germany.
September 17 » World War I: Manfred von Richthofen ("The Red Baron"), a flying ace of the German Luftstreitkräfte, wins his first aerial combat near Cambrai, France.
November 30 » Costa Rica signs the Buenos Aires Convention, a copyright treaty.
Day of death August 10, 1964
The temperature on August 10, 1964 was between 7.1 °C and 20.9 °C and averaged 14.4 °C. There was 0.1 mm of rain. There was 11.7 hours of sunshine (78%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. Source: KNMI
January 11 » Surgeon General of the United States Dr. Luther Terry, M.D., publishes the landmark report Smoking and Health: Report of the Advisory Committee to the Surgeon General of the United States saying that smoking may be hazardous to health, sparking national and worldwide anti-smoking efforts.
June 1 » Kenya becomes a republic with Jomo Kenyatta (1897 – 22 August 1978) as its first President (1964 to 1978).
June 11 » World War II veteran Walter Seifert attacks an elementary school in Cologne, Germany, killing at least eight children and two teachers and seriously injuring several more with a home-made flamethrower and a lance.
October 12 » The Soviet Union launches the Voskhod 1 into Earth orbit as the first spacecraft with a multi-person crew, and the first flight without pressure suits.
November 21 » The Verrazano-Narrows Bridge opens to traffic. At the time it is the world's longest bridge span.
December 5 » Lloyd J. Old discovered the first linkage between the major histocompatibility complex (MHC) and disease—mouse leukemia—opening the way for the recognition of the importance of the MHC in the immune response.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I22606.php : accessed February 5, 2026), "Johannes Theodorus Tromp (1887-1964)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.