The temperature on April 14, 1937 was between 9.3 °C and 13.0 °C and averaged 10.7 °C. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
April 12 » Sir Frank Whittle ground-tests the first jet engine designed to power an aircraft, at Rugby, England.
June 30 » The world's first emergency telephone number, 999, is introduced in London.
July 9 » The silent film archives of Fox Film Corporation are destroyed by the 1937 Fox vault fire.
August 24 » Spanish Civil War: the Basque Army surrenders to the Italian Corpo Truppe Volontarie following the Santoña Agreement.
September 10 » Nine nations attend the Nyon Conference to address international piracy in the Mediterranean Sea.
December 13 » Second Sino-Japanese War: Battle of Nanking: The city of Nanjing, defended by the National Revolutionary Army under the command of General Tang Shengzhi, falls to the Japanese. This is followed by the Nanking Massacre, in which Japanese troops rape and slaughter hundreds of thousands of civilians.
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/I69715.php : accessed January 29, 2026), "Cornelis Semler (1913-)".
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