The temperature on June 11, 1912 was between 11.1 °C and 20.6 °C and averaged 16.3 °C. There was 10.5 hours of sunshine (63%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 23 » The International Opium Convention is signed at The Hague.
March 6 » Italo-Turkish War: Italian forces become the first to use airships in war, as two dirigibles drop bombs on Turkish troops encamped at Janzur, from an altitude of 6,000 feet.
April 10 » RMS Titanic sets sail from Southampton, England on her maiden and only voyage.
April 20 » Opening day for baseball's Tiger Stadium in Detroit, and Fenway Park in Boston.
October 14 » Former president Theodore Roosevelt is shot and mildly wounded by John Flammang Schrank. With the fresh wound in his chest, and the bullet still within it, Roosevelt delivers his scheduled speech.
December 28 » The first municipally owned streetcars take to the streets in San Francisco.
Day of death April 29, 1967
The temperature on April 29, 1967 was between 4.6 °C and 12.8 °C and averaged 9.2 °C. There was 0.1 mm of rain during 0.4 hours. There was 9.8 hours of sunshine (66%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northwest. Source: KNMI
March 18 » The supertanker Torrey Canyon runs aground off the Cornish coast.
June 9 » Six-Day War: Israel captures the Golan Heights from Syria.
June 10 » The Six-Day War ends: Israel and Syria agree to a cease-fire.
June 17 » Nuclear weapons testing: China announces a successful test of its first thermonuclear weapon.
September 10 » The people of Gibraltar vote to remain a British dependency rather than becoming part of Spain.
December 3 » At Groote Schuur Hospital in Cape Town, South Africa, a transplant team headed by Christiaan Barnard carries out the first heart transplant on a human (53-year-old Louis Washkansky).
When copying data from this family tree, please include a reference to the origin: Wim Helsdingen, "Family tree Helsdingen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-helsdingen/I585.php : accessed February 19, 2026), "Jozef Onno van Helsdingen (1912-1967)".
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