The temperature on August 4, 1861 was about 20.3 °C. There was 0.1 mm of rain. The air pressure was 13 kgf/m2 and came mainly from the west-southwest. The airpressure was 76 cm mercury. The atmospheric humidity was 73%. Source: KNMI
From February 23, 1860 till March 14, 1861 the Netherlands had a cabinet Van Hall - Van Heemstra with the prime ministers Mr. F.A. baron Van Hall (conservatief-liberaal) and Mr. S. baron Van Heemstra (liberaal).
From March 14, 1861 till January 31, 1862 the Netherlands had a cabinet Van Zuijlen van Nijevelt - Loudon with the prime ministers Mr. J.P.P. baron Van Zuijlen van Nijevelt (conservatief-liberaal) and Mr. J. Loudon (liberaal).
March 30 » Discovery of the chemical elements: Sir William Crookes announces his discovery of thallium.
July 26 » American Civil War: George B. McClellan assumes command of the Army of the Potomac following a disastrous Union defeat at the First Battle of Bull Run.
August 10 » American Civil War: Battle of Wilson's Creek: A mixed force of Confederate, Missouri State Guard, and Arkansas State troops defeat outnumbered attacking Union forces in the southwestern part of the state.
September 6 » American Civil War: Forces under Union General Ulysses S. Grant bloodlessly capture Paducah, Kentucky, giving the Union control of the Tennessee River's mouth.
October 24 » The first transcontinental telegraph line across the United States is completed.
December 26 » American Civil War: The Trent Affair: Confederate diplomatic envoys James Murray Mason and John Slidell are freed by the United States government, thus heading off a possible war between the United States and the United Kingdom.
Day of death June 30, 1904
The temperature on June 30, 1904 was between 5.1 °C and 22.6 °C and averaged 14.9 °C. There was 14.0 hours of sunshine (84%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east-northeast. Source: KNMI
January 17 » Anton Chekhov's The Cherry Orchard receives its premiere performance at the Moscow Art Theatre.
April 8 » The French Third Republic and the United Kingdom of Great Britain and Ireland sign the Entente cordiale.
May 4 » The United States begins construction of the Panama Canal.
May 9 » The steam locomotive City of Truro becomes the first steam engine in Europe to exceed 100mph (160km/h).
June 16 » Eugen Schauman assassinates Nikolay Bobrikov, Governor-General of Finland.
July 21 » Louis Rigolly, a Frenchman, becomes the first man to break the 100mph (161km/h) barrier on land. He drove a 15-liter Gobron-Brillié in Ostend, Belgium.
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/I14388.php : accessed October 10, 2026), "Roel Merkus (1861-1904)".
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