The temperature on November 1, 1889 was about 7.9 °C. There was 2 mm of rain. The air pressure was 16 kgf/m2 and came mainly from the south. The airpressure was 76 cm mercury. The atmospheric humidity was 97%. Source: KNMI
June 6 » The Great Seattle Fire destroys all of downtown Seattle.
August 4 » The Great Fire of Spokane, Washington destroys some 32 blocks of the city, prompting a mass rebuilding project.
August 13 » William Gray of Hartford, Connecticut is granted United States Patent Number 408,709 for "Coin-controlled apparatus for telephones."
September 28 » The General Conference on Weights and Measures (CGPM) defines the length of a meter.
October 24 » Henry Parkes delivers the Tenterfield Oration, effectively starting the federation process in Australia.
Day of death December 20, 1959
The temperature on December 20, 1959 was between 7.0 °C and 11.4 °C and averaged 9.5 °C. There was 3.4 mm of rain during 2.6 hours. The heavily clouded was. The average windspeed was 6 Bft (strong wind) and was prevailing from the south-southwest. Source: KNMI
February 6 » Jack Kilby of Texas Instruments files the first patent for an integrated circuit.
February 9 » The R-7 Semyorka, the first intercontinental ballistic missile, becomes operational at Plesetsk, USSR.
February 28 » Discoverer 1, an American spy satellite that is the first object intended to achieve a polar orbit, is launched but fails to achieve orbit.
June 9 » The USSGeorge Washington is launched. It is the first nuclear-powered ballistic missile submarine.
July 29 » First United States Congress elections in Hawaii as a state of the Union.
September 16 » The first successful photocopier, the Xerox 914, is introduced in a demonstration on live television from New York City.
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/I92382.php : accessed October 24, 2026), "Johannes van Helvoirt (1889-1959)".
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