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1934 Acrostic (puzzle) An acrostic is a type of word puzzle, related somewhat to crossword puzzles, that uses an acrostic form with lettered clues and numbered blanks. The acrostic puzzle was invented in 1934 by Elizabeth Kingsley, first appearing in the March 31 edition of the Saturday Evening Post. [256] 1935 Richter magnitude scale
The dates listed in this section refer to the earliest evidence of an invention found and dated by archaeologists (or in a few cases, suggested by indirect evidence). Dates are often approximate and change as more research is done, reported and seen. Older examples of any given technology are often found.
Invention/Discovery Inventor(s) 1900: Old quantum theory: Planck 1905: Theory of relativity: Einstein 1918: Atomic transmutation: Rutherford 1932: Neutron: Chadwick 1932: Particle accelerator: Cockcroft and Walton 1935: Scanning electron microscope: Knoll 1937: Xerography: Carlson 1937: Oscilloscope: Von Ardenne, Dowling, and Bullen 1950: Modem ...
Semyon Lavochkin (1900–1960), Russia – La-series aircraft, first operational surface-to-air missile S-25 Berkut; John Bennet Lawes (1814–1900), UK – superphosphate or chemical fertilizer; Ernest Orlando Lawrence (1901–1958), U.S. – Cyclotron; Nikolai Lebedenko, Russia – Tsar Tank, largest armored vehicle in history
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 year 1900 in science and technology involved some significant events, listed below. ... Karl Landsteiner makes the first discovery of blood types, ...
1913: The crossword puzzle invented by Liverpool-born Arthur Wynne (1871–1945). 1922: Discovery of Tutankhamun's tomb by Archaeologist and Egyptologist Howard Carter, funded by Lord Carnarvon. 1933: Bayko – a plastic building model construction toy, and one of the earliest plastic toys to be marketed [249] – invented by Charles Plimpton ...
January 26 – German inventor Karl Ferdinand Braun (who will in 1909 share the Nobel Prize in Physics with Marconi) receives British Patent No. 1899-1862 for his wireless radio invention "Telegraphy without directly connected wire". [15] February 14 – Voting machines are approved by the U.S. Congress for use in federal elections.