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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
The following dates are approximations. 700 BC: Pythagoras's theorem is discovered by Baudhayana in the Hindu Shulba Sutras in Upanishadic India. [18] However, Indian mathematics, especially North Indian mathematics, generally did not have a tradition of communicating proofs, and it is not fully certain that Baudhayana or Apastamba knew of a proof.
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.
Worst industrial accident in American history. 1908 – Ford Model T appears on the market; 1908 – Root–Takahira Agreement; 1908 – Federal Bureau of Investigation established; 1908 – Aldrich–Vreeland Act; 1908 – U.S. presidential election: William Howard Taft elected president; James S. Sherman vice president.
The cotton gin, invented by Eli Whitney, revolutionized slave-based agriculture in the Southern United States.. The technological and industrial history of the United States describes the emergence of the United States as one of the most technologically advanced nations in the world in the 19th and 20th centuries.
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.
1900: Drude model by Paul Drude [449] 1900: Planck constant and Planck's law by Max Planck [450] 1900–1930: Quantum mechanics by i.a. Max Planck and Werner Heisenberg [451] 1901: Modern pyrometer by Ludwig Holborn and Ferdinand Kurlbaum [452] 1904: Boundary layer theory by Ludwig Prandtl [453] 1904: First radar system by Christian Hülsmeyer ...