The temperature on July 7, 1904 was between 10.5 °C and 22.7 °C and averaged 17.1 °C. There was 8.9 hours of sunshine (54%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
February 22 » The United Kingdom sells a meteorological station on the South Orkney Islands to Argentina; the islands are subsequently claimed by the United Kingdom in 1908.
May 15 » Russo-Japanese War: The Russian minelayer Amur lays a minefield about 15 miles off Port Arthur and sinks Japan's battleships Hatsuse, 15,000 tons, with 496 crew and Yashima.
June 15 » A fire aboard the steamboat SSGeneral Slocum in New York City's East River kills 1,000.
October 27 » The first underground New York City Subway line opens, later designated as the IRT Broadway–Seventh Avenue Line.
November 16 » English engineer John Ambrose Fleming receives a patent for the thermionic valve (vacuum tube).
December 6 » Theodore Roosevelt articulated his "Corollary" to the Monroe Doctrine, stating that the U.S. would intervene in the Western Hemisphere should Latin American governments prove incapable or unstable.
When copying data from this family tree, please include a reference to the origin: Michael Jacobs, "Family tree Jacobs", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-michael-jacobs/I91831.php : accessed May 9, 2025), "Carel Johan Janssen (1877-????)".
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