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The results of a tabulation are electrically coupled with a sorter while displayed on clock-like dials. The concept of automated data processing had been born. In 1890, Herman Hollerith invented the mechanical tabulating machine, a design used during the 1890 Census which stored and processed demographic and statistical information on punched ...
The following articles cover the timeline of United States inventions: Timeline of United States inventions (before 1890), before the turn of the century; Timeline of United States inventions (1890–1945), before World War II; Timeline of United States inventions (1946–1991), during the Cold War
1930: Subrahmanyan Chandrasekhar discovers his eponymous limit of the maximum mass of a white dwarf star; 1931: Kurt Gödel: incompleteness theorems prove formal axiomatic systems are incomplete; 1932: James Chadwick: Discovery of the neutron; 1932: Karl Guthe Jansky discovers the first astronomical radio source, Sagittarius A
December 9 – Joseph Needham (died 1995), English biochemist and writer on the history of science and technology in China. December 12 – Mária Telkes (died 1995 ), Hungarian-American scientist and inventor.
1933 – Ernst Ruska: Invention of the electron microscope; 1935 – Subrahmanyan Chandrasekhar: Chandrasekhar limit for black hole collapse; 1937 - Majorana particle, hypothesized as a fermion that is its own antiparticle. 1937 – Muon discovered by Carl David Anderson and Seth Neddermeyer; 1938 – Pyotr Kapitsa: Superfluidity discovered
Throughout the 1920s and 1930s, industrial, university, and military research continued to realize gains in the power, maneuverability, and reliability of airplanes: Charles Lindbergh completed a solo non-stop transatlantic flight in 1927, Wiley Post flew around the world in nine days in 1931, and Howard Hughes shattered flight airspeed records ...
In a 1900 speech to the International Congress of Mathematicians, David Hilbert set out a list of 23 unsolved problems in mathematics. These problems, spanning many areas of mathematics, formed a central focus for much of 20th-century mathematics. Today, 10 have been solved, 7 are partially solved, and 2 are still open.
1900: The first Zeppelin is designed by Theodor Kober. 1901: The first motorized cleaner using suction, a powered "vacuum cleaner", is patented independently by Hubert Cecil Booth and David T. Kenney. [455] 1903: The first successful gas turbine is invented by Ægidius Elling. 1903: Édouard Bénédictus invents laminated glass.