April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 11 » After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
Day of death November 11, 1991
The temperature on November 11, 1991 was between 3.8 °C and 8.6 °C and averaged 7.0 °C. There was 7.7 mm of rain during 12.2 hours. The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
In The Netherlands , there was from Tuesday, November 7, 1989 to Monday, August 22, 1994 the cabinet Lubbers III, with Drs. R.F.M. Lubbers (CDA) as prime minister.
May 19 » Croatians vote for independence in a referendum.
June 10 » Eleven-year-old Jaycee Lee Dugard is kidnapped in South Lake Tahoe, California; she would remain a captive until 2009.
July 31 » The United States and Soviet Union both sign the START I Strategic Arms Reduction Treaty, the first to reduce (with verification) both countries' stockpiles.
August 27 » Moldova declares independence from the USSR.
September 5 » The current international treaty defending indigenous peoples, Indigenous and Tribal Peoples Convention, 1989, comes into force.
December 2 » Canada and Poland become the first nations to recognize the independence of Ukraine from the Soviet Union.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I75930.php : accessed October 9, 2026), "Jilles Tjoelker (1897-1991)".
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