January 12 » The National Trust is founded in the United Kingdom.
January 13 » First Italo-Ethiopian War: the war's opening battle, the Battle of Coatit, occurs; it is an Italian victory.
February 9 » William G. Morgan creates a game called Mintonette, which soon comes to be referred to as volleyball.
May 25 » The Republic of Formosa is formed, with Tang Jingsong as its president.
September 18 » The Atlanta Exposition Speech on race relations is delivered by Booker T. Washington.
November 8 » While experimenting with electricity, Wilhelm Röntgen discovers the X-ray.
Day of death April 18, 1930
The temperature on April 18, 1930 was between 1.4 °C and 9.1 °C and averaged 6.0 °C. There was 1.7 mm of rain during 1.8 hours. There was 1.6 hours of sunshine (11%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 10 » The Việt Nam Quốc Dân Đảng launches the failed Yên Bái mutiny in hope to overthrow French protectorate over Vietnam.
March 13 » The news of the discovery of Pluto is announced by Lowell Observatory.
April 6 » At the end of the Salt March, Gandhi raises a lump of mud and salt and declares, "With this, I am shaking the foundations of the British Empire."
May 24 » Amy Johnson lands in Darwin, Northern Territory, becoming the first woman to fly solo from England to Australia (she left on May 5 for the 11,000 mile flight).
August 29 » The last 36 remaining inhabitants of St Kilda are voluntarily evacuated to other parts of Scotland.
September 8 » 3M begins marketing Scotch transparent tape.
When copying data from this family tree, please include a reference to the origin: G. Polman, "Family tree Daniel(s)", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-daniel/I314.php : accessed January 1, 2026), "Theodora-Johanna van Os (1895-1930)".
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