The temperature on April 18, 1887 was about 13.2 °C. The air pressure was 14 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.
February 2 » In Punxsutawney, Pennsylvania the first Groundhog Day is observed.
April 4 » Argonia, Kansas elects Susanna M. Salter as the first female mayor in the United States.
June 8 » Herman Hollerith applies for US patent #395,781 for the 'Art of Compiling Statistics', which was his punched card calculator.
September 5 » A fire at the Theatre Royal, Exeter, kills 186.
October 1 » Balochistan is conquered by the British Empire.
November 13 » Bloody Sunday clashes in central London.
Day of death February 18, 1975
The temperature on February 18, 1975 was between 2.8 °C and 10.1 °C and averaged 6.4 °C. There was 4.4 mm of rain during 4.8 hours. There was 1.0 hours of sunshine (10%). The heavily clouded was. The average windspeed was 1 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
April 25 » As North Vietnamese forces close in on the South Vietnamese capital Saigon, the Australian Embassy is closed and evacuated, almost ten years to the day since the first Australian troop commitment to South Vietnam.
June 5 » The United Kingdom holds its first country-wide referendum on membership of the European Economic Community (EEC).
August 4 » The Japanese Red Army takes more than 50 hostages at the AIA Building housing several embassies in Kuala Lumpur, Malaysia. The hostages include the U.S. consul and the Swedish Chargé d'affaires. The gunmen win the release of five imprisoned comrades and fly with them to Libya.
September 4 » The Sinai Interim Agreement relating to the Arab–Israeli conflict is signed.
October 22 » The Soviet unmanned space mission Venera 9 lands on Venus.
November 7 » In Bangladesh, a joint force of people and soldiers takes part in an uprising led by Colonel Abu Taher that ousts and kills Brigadier Khaled Mosharraf, freeing the then house-arrested army chief and future president Maj-Gen. Ziaur Rahman.
When copying data from this family tree, please include a reference to the origin: C. Blom, "Family tree Blom", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_blom/I297.php : accessed February 2, 2026), "Theodorus Graeff (1887-1975)".
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