The temperature on September 27, 1880 was about 17.6 °C. The air pressure was 1 kgf/m2 and came mainly from the northeast. The airpressure was 77 cm mercury. The atmospheric humidity was 78%. Source: KNMI
In The Netherlands , there was from August 20, 1879 to April 23, 1883 the cabinet Van Lijnden van Sandenburg, with Mr. C.Th. baron Van Lijnden van Sandenburg (conservatief-AR) as prime minister.
January 27 » Thomas Edison receives a patent for his incandescent lamp.
February 13 » Thomas Edison observes Thermionic emission.
May 11 » Seven people are killed in the Mussel Slough Tragedy, a gun battle in California.
June 7 » War of the Pacific: The Battle of Arica, the assault and capture of Morro de Arica (Arica Cape), ends the Campaña del Desierto (Desert Campaign).
September 16 » The Cornell Daily Sun prints its first issue in Ithaca, New York. The Sun is the United States' oldest, continuously-independent college daily.
December 16 » Outbreak of the First Boer War between the Boer South African Republic and the British Empire.
Day of marriage April 6, 1910
The temperature on April 6, 1910 was between 5.3 °C and 14.0 °C and averaged 8.7 °C. There was 4.5 hours of sunshine (34%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 15 » Construction ends on the Buffalo Bill Dam in Wyoming, United States, which was the highest dam in the world at the time, at 325ft (99m).
April 12 » SMSZrínyi, one of the last pre-dreadnought battleships built by the Austro-Hungarian Navy, is launched.
May 4 » The Royal Canadian Navy is created.
May 31 » The South Africa Act comes into force, establishing the Union of South Africa.
June 25 » Igor Stravinsky's ballet The Firebird is premiered in Paris, bringing him to prominence as a composer.
October 21 » HMSNiobe arrives in Halifax Harbour to become the first ship of the Royal Canadian Navy.
Day of death June 12, 1944
The temperature on June 12, 1944 was between 9.6 °C and 17.4 °C and averaged 14.2 °C. There was 2.5 mm of rain during 2.3 hours. There was 11.0 hours of sunshine (66%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
April 22 » The 1st Air Commando Group using Sikorsky R-4 helicopters stage the first use of helicopters in combat with combat search and rescue operations in the China Burma India Theater.
July 20 » World War II: Adolf Hitler survives an assassination attempt led by German Army Colonel Claus von Stauffenberg.
August 2 » ASNOM: Birth of the Socialist Republic of Macedonia, celebrated as Day of the Republic in North Macedonia.
September 19 » World War II: The Moscow Armistice between Finland and the Soviet Union is signed.
November 21 » World War II: American submarine USS Sealion sinks the Japanese battleship Kongō and Japanese destroyer Urakaze in the Formosa Strait.
December 22 » World War II: Battle of the Bulge: German troops demand the surrender of United States troops at Bastogne, Belgium, prompting the famous one word reply by General Anthony McAuliffe: "Nuts!"
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I3580.php : accessed March 13, 2026), "Hermanus de Graaf (1880-1944)".
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