January 12 » The National Trust is founded in the United Kingdom.
February 1 » Fountains Valley, Pretoria, the oldest nature reserve in Africa, is proclaimed by President Paul Kruger.
February 9 » William G. Morgan creates a game called Mintonette, which soon comes to be referred to as volleyball.
June 20 » The Kiel Canal, crossing the base of the Jutland peninsula and the busiest artificial waterway in the world, is officially opened.
December 28 » The Lumière brothers perform for their first paying audience at the Grand Cafe in Boulevard des Capucines.
December 28 » Wilhelm Röntgen publishes a paper detailing his discovery of a new type of radiation, which later will be known as x-rays.
Day of marriage August 7, 1919
The temperature on August 7, 1919 was between 8.4 °C and 19.4 °C and averaged 13.9 °C. There was 7.1 hours of sunshine (47%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
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.
January 18 » World War I: The Paris Peace Conference opens in Versailles, France.
February 6 » The five-day Seattle General Strike begins, as more than 65,000 workers in the city of Seattle, Washington, walk off the job.
February 26 » President Woodrow Wilson signs an act of Congress establishing the Grand Canyon National Park.
March 23 » In Milan, Italy, Benito Mussolini founds his Fascist political movement.
April 13 » Jallianwala Bagh massacre: British Indian Army troops lead by Brigadier-General Reginald Dyer killed approx 379-1000 unarmed demonstrators including men and women in Amritsar, India; and approximately 1,500 injured.
August 8 » The Anglo-Afghan Treaty of 1919 is signed. It establishes peaceful relations between Afghanistan and the UK, and confirms the Durand line as the mutual border. In return, the UK is no longer obligated to subsidize the Afghan government.
Day of death September 5, 1971
The temperature on September 5, 1971 was between 4.4 °C and 21.0 °C and averaged 13.4 °C. There was -0.1 mm of rain. There was 11.8 hours of sunshine (88%). The partly clouded was. The average windspeed was 1 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
February 2 » The international Ramsar Convention for the conservation and sustainable utilization of wetlands is signed in Ramsar, Mazandaran, Iran.
February 9 » Satchel Paige becomes the first Negro League player to be voted into the USA's Baseball Hall of Fame.
March 1 » President of Pakistan Yahya Khan indefinitely postpones the pending national assembly session, precipitating massive civil disobedience in East Pakistan.
October 1 » The first practical CT scanner is used to diagnose a patient.
December 3 » Indo-Pakistani War of 1971: Pakistan launches a pre-emptive strike against India and a full-scale war begins.
December 7 » The Battle of Sylhet is fought between the Pakistani military and the Mukti Bahini.
When copying data from this family tree, please include a reference to the origin: J. van Broekhoven, "Database Van Broekhoven", database, Genealogy Online (https://www.genealogieonline.nl/database-van-broekhoven/I86115.php : accessed February 16, 2026), "Petronella Helena Maas (1895-1971)".
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