The temperature on September 11, 1867 was about 20.1 °C. The air pressure was 1 kgf/m2 and came mainly from the southwest. The airpressure was 76 cm mercury. The atmospheric humidity was 62%. Source: KNMI
From June 1, 1866 till June 4, 1868 the Netherlands had a cabinet Van Zuijlen van Nijevelt - Heemskerk with the prime ministers Mr. J.P.J.A. graaf Van Zuijlen van Nijevelt (AR) and Mr. J. Heemskerk Azn. (conservatief).
January 8 » African American men are granted the right to vote in Washington, D.C.
February 13 » Work begins on the covering of the Senne, burying Brussels's primary river and creating the modern central boulevards.
April 1 » Singapore becomes a British crown colony.
June 19 » Maximilian I of the Second Mexican Empire is executed by a firing squad in Querétaro, Querétaro.
July 17 » Harvard School of Dental Medicine is established in Boston, Massachusetts. It is the first dental school in the U.S. that is affiliated with a university.
October 21 » The Medicine Lodge Treaty is signed by southern Great Plains Indian leaders. The treaty requires Native American Plains tribes to relocate to a reservation in western Oklahoma.
Day of death June 12, 1936
The temperature on June 12, 1936 was between 4.5 °C and 20.1 °C and averaged 13.5 °C. There was 6.3 hours of sunshine (38%). The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
March 16 » Warmer-than-normal temperatures rapidly melt snow and ice on the upper Allegheny and Monongahela rivers, leading to a major flood in Pittsburgh.
August 10 » Spanish Civil War: The Regional Defence Council of Aragon is dissolved by the Spanish Republic.
October 1 » Spanish Civil War: Francisco Franco is named head of the Nationalist government of Spain.
October 9 » Boulder Dam (later Hoover Dam) begins to generate electricity and transmit it to Los Angeles.
October 26 » The first electric generator at Hoover Dam goes into full operation.
October 27 » Mrs Wallis Simpson obtains her divorce, which would eventually allow her to marry King Edward VIII of the United Kingdom, thus forcing his abdication from the throne.
When copying data from this family tree, please include a reference to the origin: W. Rovers, "Family tree Ro(o)vers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_rovers/I28646.php : accessed January 28, 2026), "Johannes Martinus Rovers (1867-1936)".
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