1931 in science

The year 1931 in science and technology involved some significant events, listed below.

Astronomy

Erich Hückel proposes Hückel's rule, which explains when a planar ring molecule will have aromatic properties.^[1]
Harold Urey and associates at Columbia University demonstrate the existence of heavy water.^[2]

Het Nederlandsch Historisch Natuurwetenschappelijk Museum ("The Dutch Historical Museum of the Natural Sciences") opens in Leiden.

January – Kurt Gödel's "On Formally Undecidable Propositions..." is published in Monatshefte für Mathematik.

Ernst Ruska and Max Knoll build the first prototype electron microscope.
Harold Urey discovers deuterium by the fractional distillation of liquid hydrogen.

May 27 – Swiss-born scientist Auguste Piccard and his assistant, engineer Paul Kipfer, taking off from Augsburg, Germany, reach a record altitude of 15,785 m (51,788 ft) in a balloon with a pressurized gondola, gathering data on the upper atmosphere and measuring cosmic rays, the first human flight into the stratosphere.
October 5 – American aviators Clyde Edward Pangborn and Hugh Herndon, Jr., complete the first non-stop flight across the Pacific Ocean, from Misawa, Japan, to East Wenatchee, Washington, in 41½ hours.^[3]
October 24 – The George Washington Bridge across the Hudson River in the United States is dedicated; it opens to traffic the following day. At 3,500 feet (1,100 m), it nearly doubles the previous record for the longest suspension span in the world.
December 14 – British electronics engineer Alan Blumlein of EMI submits a UK patent application for "Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems" – binaural or stereophonic sound.
László Bíró first exhibits his ballpoint pen, in Budapest.
George Beauchamp invents the electric guitar.^[4]
Construction of the Hoover Dam begins on the Colorado River in the United States (chief designing engineer: John L. Savage).

January 3 – Albert Einstein begins doing research at the California Institute of Technology, along with astronomer Edwin Hubble. In October the Caltech Department of Physics faculty and graduate students meet with Einstein as a guest.
November 21 – Release of James Whale's film of Frankenstein in New York, with electrical effects designed by Kenneth Strickfaden.

January 20 – David Lee, American physicist, recipient of the Nobel Prize in Physics.
February 10 – Carl Rettenmeyer (died 2009), American biologist specialising in army ants.
March 22 – Burton Richter, American physicist, recipient of the Nobel Prize in Physics.
March 25 – John A. Eddy (died 2009), American astronomer.
May 31 – John Robert Schrieffer, American physicist, recipient of the Nobel Prize in Physics.
June 27 – Martinus J. G. Veltman, Dutch physicist, recipient of the Nobel Prize in Physics.
August 15 – Richard F. Heck (died 2015), American chemist, recipient of the Nobel Prize in Chemistry.
August 20 – Ayhan Ulubelen, Turkish natural product chemist.
August 23 – Hamilton O. Smith, American microbiologist, recipient of the Nobel Prize in Physiology or Medicine.
August 30 – Jack Swigert (died 1982), American astronaut.
September 10 – Idelisa Bonnelly, Dominican marine biologist.
September 27 – W. Maxwell Cowan (died 2002), South African neuroanatomist.
September 29 – James Watson Cronin (died 2016), American nuclear physicist, recipient of the Nobel Prize in Physics.
October 6 – Riccardo Giacconi, Italian-born physicist, recipient of the Nobel Prize in Physics.
October 12 – Ole-Johan Dahl (died 2002), Norwegian computer scientist, pioneer of object-oriented programming.
October 15 – A. P. J. Abdul Kalam (died 2015), President of India and rocket scientist.

↑ Rzepa, Henry S. "The aromaticity of Pericyclic reaction transition states". Department of Chemistry, Imperial College London. Retrieved 2007-03-26.
↑ Urey, Harold C.; Brickwedde, F. G.; Murphy, G. M. (1932). "A Hydrogen Isotope of Mass 2". Physical Review. 39: 164–5. Bibcode:1932PhRv...39..164U. doi:10.1103/PhysRev.39.164. Retrieved 2012-01-08.
↑ "Pangborn-Herndon Memorial Site". Aviation: From Sand Dunes To Sonic Booms. National Park Service. Retrieved 2012-05-31.
↑ Millard, André, ed. (2004). The Electric Guitar: a History of an American Icon. Baltimore: The Johns Hopkins University Press. ISBN 0-8018-7862-4.

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