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.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
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.
November 1 » The first Library of Congress building opens its doors to the public; the library had previously been housed in the Congressional Reading Room in the U.S. Capitol.
Day of marriage May 31, 1947
The temperature on May 31, 1947 was between 14.4 °C and 28.3 °C and averaged 22.1 °C. There was 14.3 hours of sunshine (87%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
February 12 » Christian Dior unveils a "New Look", helping Paris regain its position as the capital of the fashion world.
February 25 » The formal abolition of Prussia is proclaimed by the Allied Control Council, the Prussian government having already been abolished by the Preußenschlag of 1932.
March 25 » An explosion in a coal mine in Centralia, Illinois kills 111.
April 9 » The Glazier–Higgins–Woodward tornadoes kill 181 and injure 970 in Texas, Oklahoma, and Kansas.
August 14 » Pakistan gains Independence from the British Empire and joins the Commonwealth of Nations.
November 29 » First Indochina War: French forces carry out a massacre at Mỹ Trạch, Vietnam.
Day of death February 28, 1985
The temperature on February 28, 1985 was between 0.4 °C and 2.4 °C and averaged 1.3 °C. There was -0.1 mm of rain. The almost completely overcast was. The average windspeed was 1 Bft (weak wind) and was prevailing from the north. Source: KNMI
In The Netherlands , there was from Thursday, November 4, 1982 to Monday, July 14, 1986 the cabinet Lubbers I, with Drs. R.F.M. Lubbers (CDA) as prime minister.
February 19 » Iberia Airlines Boeing 727 crashes into Mount Oiz in Spain, killing 148.
February 19 » William J. Schroeder becomes the first recipient of an artificial heart to leave the hospital.
March 20 » Canadian paraplegic athlete and humanitarian Rick Hansen begins his circumnavigation of the globe in a wheelchair in the name of spinal cord injury medical research.
April 19 » Two hundred ATF and FBI agents lay siege to the compound of the white supremacist survivalist group The Covenant, The Sword, and the Arm of the Lord in Arkansas; the CSA surrenders two days later.
July 13 » The Live Aid benefit concert takes place in London and Philadelphia, as well as other venues such as Moscow and Sydney.
November 19 » Pennzoil wins a US$10.53 billion judgment against Texaco, in the largest civil verdict in the history of the United States, stemming from Texaco executing a contract to buy Getty Oil after Pennzoil had entered into an unsigned, yet still binding, buyout contract with Getty.
When copying data from this family tree, please include a reference to the origin: Jacobus Trox, "Lap family tree", database, Genealogy Online (https://www.genealogieonline.nl/lap-stamboom/I2115.php : accessed January 9, 2026), "Johanna Ruiter (1897-1985)".
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