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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
It was not until 1930, he is called a " telescreen sold "at a price of 20 pounds. 1927 The first fully electronic music boxes ("Jukeboxes") used in the USA on the market. German Grammophon on sale due to a license agreement with the Brunswick-Balke-Collender Company. Its first fully electronic turntables.
Ruth Wakefield of Whitman, Massachusetts, invented chocolate chips and chocolate chip cookies in 1930. Her new cookie invention was called the "Toll House Cookie" which used broken-up bars of semi-sweet chocolate. [236] 1930 Thermistor. A thermistor is a type of resistor with electrical resistance inversely proportional to its temperature.
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
1839, 1930: Discovery of polystyrene by Eduard Simon, was made a commercial product by IG Farben in 1930 [131] c. 1840: Nitrogen-based fertiliser by Justus von Liebig, [132] important innovations were later made by Fritz Haber and Carl Bosch (Haber process) in the 1900s [133] 1846: Discovery of guncotton by Christian Friedrich Schönbein [134]
By the 1930s, the broadcast receiver had become a common household item, with standardized controls that anyone could use. [85] The invention of the transistor in 1947 again revolutionized radio technology, making truly portable receivers possible, beginning with transistor radios in the late 1950s. [86]
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. December 17 – Mary Cartwright (died 1998), English mathematician, one of the first people to analyze a dynamical system with chaos. [17]
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