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.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
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.
December 9 » Activist Marguerite Durand founds the feminist daily newspaper La Fronde in Paris.
Day of marriage March 30, 1918
The temperature on March 30, 1918 was between 4.0 °C and 10.1 °C and averaged 7.1 °C. There was 0.5 mm of rain. There was 0.1 hours of sunshine (1%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. 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.
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
June 8 » A solar eclipse is observed at Baker City, Oregon by scientists and an artist hired by the United States Navy.
July 9 » In Nashville, Tennessee, an inbound local train collides with an outbound express, killing 101 and injuring 171 people, making it the deadliest rail accident in United States history.
August 21 » World War I: The Second Battle of the Somme begins.
October 3 » King Boris III of Bulgaria accedes to the throne.
October 9 » The Finnish Parliament offers to Prince Frederick Charles of Hesse the throne of a short-lived Kingdom of Finland.
Day of death April 11, 1951
The temperature on April 11, 1951 was between 0.3 °C and 7.8 °C and averaged 4.2 °C. There was 0.3 mm of rain during 0.3 hours. There was 7.9 hours of sunshine (58%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
In The Netherlands , there was from March 15, 1951 to September 2, 1952 the cabinet Drees I, with Dr. W. Drees (PvdA) as prime minister.
January 27 » Nuclear testing at the Nevada Test Site begins with Operation Ranger.
February 9 » Korean War: The two-day Geochang massacre begins as a battalion of the 11th Division of the South Korean Army kills 719 unarmed citizens in Geochang, in the South Gyeongsang district of South Korea
February 27 » The Twenty-second Amendment to the United States Constitution, limiting Presidents to two terms, is ratified.
April 17 » The Peak District becomes the United Kingdom's first National Park.
June 14 » UNIVAC I is dedicated by the U.S. Census Bureau.
June 23 » The ocean liner SS United States is christened and launched.
When copying data from this family tree, please include a reference to the origin: H. Poelman, "Family tree Van Wijk", database, Genealogy Online (https://www.genealogieonline.nl/van-wijk-stamboom/I941.php : accessed February 25, 2026), "Pieter van der Heide (1897-1951)".
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