1927 in science The year 1927 in science and technology involved some significant events, listed below.Astronomy and astrophysics Edward Emerson Barnard's A Photographic Atlas of Selected Regions of the Milky Way is published posthumously.Botany The Cholodny-Went model of tropism in emerging monocotyledon shoots is first proposed by Nikolai Cholodny of the University of Kiev . Fritz London and Walter Heitler apply quantum mechanics to explain covalent bonding in the hydrogen molecule , which marks the birth of quantum chemistry .Environment Carbon emissions from fossil fuel burning and industry reach one billion tonnes per year.Genetics American biologist Raymond Pearl publishes an influential attack on the basic assumptions of eugenics .Mathematics Publication of the 2nd edition of Principia Mathematica by Alfred North Whitehead and Bertrand Russell , one of the most important and seminal works in mathematical logic and philosophy. António Egas Moniz develops cerebral angiography . February 23 – German theoretical physicist Werner Heisenberg writes a letter to fellow physicist Wolfgang Pauli in which he describes his uncertainty principle for the first time . April – Abbé Georges Lemaître publishes in the Annales de la Société Scientifique de Bruxelles "Un Univers homogène de masse constante et de rayon croissant rendant compte de la vitesse radiale des nébuleuses extra-galactiques" proposing the theory of the expansion of the Universe , deriving what will become known as Hubble's law , making the first estimation of what will become called the Hubble constant, and proposing what becomes known as the Big Bang theory of the origin of the Universe , which he calls his 'hypothesis of the primeval atom'. October – The fifth Solvay Conference meets in Brussels to discuss the newly formulated quantum mechanics. Albert Einstein attacks the theories of Niels Bohr and Werner Heisenberg.Technology August 2 – American electrical engineer Harold Stephen Black invents the negative-feedback amplifier . September 7 – Philo Farnsworth's electronic image dissector television camera tube transmits its first image at his laboratory at 202 Green Street in San Francisco . November 5 – Completion of a bridge by Westinghouse Electric and Manufacturing in Turtle Creek, Pennsylvania , the world's first railroad bridge of wholly welded construction. Date unknown * Emil Lerp invents the transportable gasoline chainsaw . * Vibraphone developed in its modern form by Henry Schluter of J.C. Deagan, Inc. in the United States.Zoology Last known specimens of the Syrian wild ass die.Awards Nobel Prizes * Physics – Arthur Holly Compton , Charles Thomson Rees Wilson * Chemistry – Heinrich Otto Wieland * Medicine – Julius Wagner-Jauregg Copley Medal: Charles Sherrington Wollaston Medal for Geology: William Whitehead Watts Births January 13 – Sydney Brenner South African-born molecular biologist ; recipient of Nobel Prize in Physiology or Medicine . January 29 – Lewis Urry , Canadian inventor of the long-lasting alkaline battery . March 9 – Julian Tudor Hart , British physician . March 16 – Vladimir Komarov , Russian cosmonaut on Soyuz 1 . April 4 – Frederick I. Ordway III, American space scientist April 10 – Marshall Warren Nirenberg , American biochemist and geneticist ; recipient of Nobel Prize in Physiology or Medicine. April 18 – Nicole Grasset , Swiss-French medical virologist and microbiologist-epidemiologist. April 26 – Anne McLaren , English developmental biologist . April 29 – Walter Thirring , Austrian mathematical physicist. May 26 – Endel Tulving , Estonian-Canadian experimental psychologist , cognitive neuroscientist June 10 – Eugene Parker , American solar astrophysicist . June 21 – Ye Shuhua , Chinese astronomer. June 22 – Karl Schügerl , Hungarian chemical engineer July 2 – R. J. G. Savage, Northern Ireland-born palaeontologist . July 29 – Gerald Westbury , English cancer surgeon. August 2 – Gabriel Horn , English biologist. August 9 – Marvin Minsky , American computer scientist , pioneer of artificial intelligence . September 4 – John McCarthy , American computer scientist and cognitive scientist . October 27 – Mikhail Postnikov , Soviet mathematician , known for his work in algebraic and differential topology . November 12 – Yutaka Taniyama , Japanese mathematician. November 13 – Billy Klüver , Swedish-American engineer, co-founded Experiments in Art and Technology November 20 – Kikuo Takano , Japanese poet and mathematician. November 27 – Arnold Clark , Scottish inventor December 23 – Edith Irby Jones , born Edith Mae Irby , African American physician. December 27 – George Streisinger , Hungarian-born molecular biologist; first person to clone a vertebrate.Deaths January 19 – Carl Gräbe , German chemist . February 9 – Charles Walcott , American paleontologist . March 27 – William Healey Dall , American malacologist and explorer. May 2 – Ernest Starling , English physiologist . August 3 – Edward B. Titchener, American structuralist psychologist. August 13 – James Oliver Curwood , American novelist and conservationist . September 14 – Julian Sochocki , Polish-born mathematician. October 2 – Svante Arrhenius , Swedish winner of the Nobel Prize in Chemistry . November 11 – Wilhelm Johannsen , Danish plant physiologist and geneticist. December 2 – Paul Heinrich von Groth , German mineralogist . December 24 – Vladimir Bekhterev , Russian psychologist.
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