April 8 » In Pollock v. Farmers' Loan & Trust Co. the Supreme Court of the United States declares unapportioned income tax to be unconstitutional.
April 17 » The Treaty of Shimonoseki between China and Japan is signed. This marks the end of the First Sino-Japanese War, and the defeated Qing Empire is forced to renounce its claims on Korea and to concede the southern portion of the Fengtien province, Taiwan and the Pescadores Islands to Japan.
April 24 » Joshua Slocum, the first person to sail single-handedly around the world, sets sail from Boston, Massachusetts aboard the sloop "Spray".
October 8 » Korean Empress Myeongseong is assassinated by Japanese infiltrators.
November 5 » George B. Selden is granted the first U.S. patent for an automobile.
November 8 » While experimenting with electricity, Wilhelm Röntgen discovers the X-ray.
Day of death May 12, 1978
The temperature on May 12, 1978 was between 5.3 °C and 10.8 °C and averaged 7.7 °C. There was 6.1 mm of rain during 3.6 hours. There was 1.4 hours of sunshine (9%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
March 9 » President Soeharto inaugurated Jagorawi Toll Road, the first toll highway in Indonesia, connecting Jakarta, Bogor and Ciawi, West Java.
May 12 » In Zaire, rebels occupy the city of Kolwezi, the mining center of the province of Shaba (now known as Katanga); the local government asks the US, France and Belgium to restore order.
August 22 » The District of Columbia Voting Rights Amendment is passed by the U.S. Congress. The proposed amendment would have provided the District of Columbia with full voting representation in the Congress, the Electoral College, and regarding amending the U.S. Constitution. The proposed amendment failed to be ratified by enough states (ratified by 16, needed 38) and so did not become part of the Constitution.
November 14 » France conducts the Aphrodite nuclear test as 25th in the group of 29, 1975–78 French nuclear tests.
December 4 » Following the murder of Mayor George Moscone, Dianne Feinstein becomes San Francisco's first female mayor.
December 22 » The pivotal Third Plenum of the 11th National Congress of the Communist Party of China is held in Beijing, with Deng Xiaoping reversing Mao-era policies to pursue a program for Chinese economic reform.
When copying data from this family tree, please include a reference to the origin: K. Mansier, "Family tree Mansier", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-mansier/I697.php : accessed March 2, 2026), "Hendrik Schoemaker (1895-1978)".
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