The temperature on January 18, 1911 was between 1.4 °C and 5.0 °C and averaged 3.5 °C. There was 0.1 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
May 15 » More than 300 Chinese immigrants are killed in the Torreón massacre when the forces of the Mexican Revolution led by Emilio Madero take the city of Torreón from the Federales.
May 19 » Parks Canada, the world's first national park service, is established as the Dominion Parks Branch under the Department of the Interior.
June 16 » IBM founded as the Computing-Tabulating-Recording Company in Endicott, New York.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
September 29 » Italy declares war on the Ottoman Empire.
Day of marriage December 7, 1939
The temperature on December 7, 1939 was between -2.2 °C and 5.8 °C and averaged 1.6 °C. There was 0.1 mm of rain. There was 2.2 hours of sunshine (28%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from June 24, 1937 to July 25, 1939 the cabinet Colijn IV, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from July 25, 1939 to August 10, 1939 the cabinet Colijn V, with Dr. H. Colijn (ARP) as prime minister.
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
May 23 » The U.S. Navy submarine USS Squalus sinks off the coast of New Hampshire during a test dive, causing the death of 24 sailors and two civilian technicians. The remaining 32 sailors and one civilian naval architect are rescued the following day.
August 15 » Twenty-six Junkers Ju 87 bombers commanded by Walter Sigel meet unexpected ground fog during a dive-bombing demonstration for Luftwaffe generals at Neuhammer. Thirteen of them crash and burn.
September 1 » World War II: Nazi Germany and Slovakia invade Poland, beginning the European phase of World War II.
November 26 » Shelling of Mainila: The Soviet Army orchestrates an incident which is used to justify the start of the Winter War with Finland four days later.
December 4 » World War II: HMSNelson is struck by a mine (laid by U-31) off the Scottish coast and is laid up for repairs until August 1940.
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/I118830.php : accessed January 2, 2026), "Hendrik Plantinga (1911-)".
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