February 9 » William G. Morgan creates a game called Mintonette, which soon comes to be referred to as volleyball.
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.
May 7 » In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
September 3 » John Brallier becomes the first openly professional American football player, when he was paid US$10 by David Berry, to play for the Latrobe Athletic Association in a 12-0 win over the Jeanette Athletic Association.
October 4 » Horace Rawlins wins the first U.S. Open Men's Golf Championship.
November 27 » At the Swedish–Norwegian Club in Paris, Alfred Nobel signs his last will and testament, setting aside his estate to establish the Nobel Prize after he dies.
Day of death September 15, 1973
The temperature on September 15, 1973 was between 8.2 °C and 25.0 °C and averaged 16.7 °C. There was 10.7 hours of sunshine (84%). The average windspeed was 2 Bft (weak wind) and was prevailing from the east. Source: KNMI
In The Netherlands , there was from Thursday, July 20, 1972 to Friday, May 11, 1973 the cabinet Biesheuvel II, with Mr. B.W. Biesheuvel (ARP) as prime minister.
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
July 29 » Driver Roger Williamson is killed during the Dutch Grand Prix, after a suspected tire failure causes his car to pitch into the barriers at high speed.
August 22 » The Congress of Chile votes in favour of a resolution condemning President Salvador Allende's government and demands that he resign or else be unseated through force and new elections.
August 23 » A bank robbery gone wrong in Stockholm, Sweden, turns into a hostage crisis; over the next five days the hostages begin to sympathise with their captors, leading to the term "Stockholm syndrome".
September 26 » Concorde makes its first non-stop crossing of the Atlantic in record-breaking time.
October 16 » Henry Kissinger and Lê Đức Thọ are awarded the Nobel Peace Prize.
December 21 » The Geneva Conference on the Arab–Israeli conflict opens.
When copying data from this family tree, please include a reference to the origin: Ellen Stempher-Hellwig, "Family tree Hellwig", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-hellwig/R144.php : accessed October 13, 2026), "Mai - Maria Barbara /Helwig (Mai - Maria Barbara) Hellewig (1895-1973)".
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