April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 12 » Tirah Campaign: In the Battle of Saragarhi, ten thousand Pashtun tribesmen suffer several hundred casualties while attacking 21 Sikh soldiers in British service.
November 1 » The first Library of Congress building opens its doors to the public; the library had previously been housed in the Congressional Reading Room in the U.S. Capitol.
December 30 » The British Colony of Natal annexes Zululand.
Day of death April 29, 1949
The temperature on April 29, 1949 was between 2.3 °C and 11.2 °C and averaged 8.1 °C. There was 7.9 mm of rain during 11.6 hours. There was 3.7 hours of sunshine (25%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
May 12 » Cold War: The Soviet Union lifts its blockade of Berlin.
May 23 » Cold War: The Western occupying powers approve the Basic Law and establish a new German state, the Federal Republic of Germany.
August 31 » The retreat of the Democratic Army of Greece in Albania after its defeat on Gramos mountain marks the end of the Greek Civil War.
October 28 » An Air France Lockheed Constellation crashes in the Azores, killing all 48 people on board.
November 2 » The Dutch–Indonesian Round Table Conference ends with the Netherlands agreeing to transfer sovereignty of the Dutch East Indies to the United States of Indonesia.
November 3 » Chinese Civil War: The Battle of Dengbu Island occurs.
When copying data from this family tree, please include a reference to the origin: Hendrik Dreyer, "Dreyer Tree", database, Genealogy Online (https://www.genealogieonline.nl/dreyer-tree/I8005.php : accessed January 17, 2026), "Petrus Jacobus Dreyer b5c1d1e2f2g9 (1897-1949)".
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