1929 жылғы ғылым мен технология жетістіктері

The year 1929 in science and technology involved some significant events, listed below.

July – Henry Norris Russell publishes his finding that hydrogen is the principal constituent of stars, acknowledging the previous demonstration of this by Cecilia Payne. July 17 – Robert H. Goddard tests the first rocket to carry scientific instruments (a barometer and a camera). Edwin Hubble publishes his discovery that the speed at which galaxies recede positively correlates with their distance, which becomes known as Hubble's law, the basis for understanding that the universe is expanding. George Gamow proposes hydrogen fusion as the energy source for stars. Clyde Tombaugh discovers several asteroids: 2839 Annette, 3583 Burdett, 3824 Brendalee, 1929 VS, 1929 VD1. Harold Horton Sheldon writes about the serious possibility of man visiting other planets through the use of rockets. Konstantin Tsiolkovsky proposes the construction of multistage rockets in his book «Космические поезда» (Cosmic Trains).

July 5 – The Curtiss Wright corporation is founded. August 8–29 – The German airship Graf Zeppelin makes a round the world flight. September 24 – Jimmy Doolittle takes off, flies over a set course, and lands by flight instruments alone. November 29 – US Admiral Richard Byrd becomes the first person to fly over the South Pole. December 16 – The British airship R100 makes its maiden flight, incorporating Barnes Wallis' pioneering use of a geodetic airframe. December 5 – Grumman Aircraft Engineering Corporation is founded.

Carl and Gerty Cori propose the Cori cycle, describing how the human body processes carbohydrates. Adenosine triphosphate (ATP), an important cell coenzyme, is discovered by German biochemist Karl Lohmann, and independently by Cyrus Fiske and Yellapragada Subbarow of Harvard Medical School. Estrogen was isolated and purified estrone, the first estrogen to be discovered by Adolf Butenandt.

C. B. van Niel makes the first announcement of his discovery that photosynthesis is a light dependent redox reaction. Professor Frederick Gericke of the University of California, Los Angeles, demonstrates that plants can be grown soil free all the way to maturity, the basis of hydroponics.

Sir John Lennard Jones introduces his linear combination of atomic orbitals method for approximation of molecular orbitals. Lars Onsager publishes his reciprocal relations equations in thermodynamics, for which he will receive the 1968 Nobel Prize in Chemistry. Linus Pauling publishes Pauling's rules, key principles for the use of X ray crystallography to deduce molecular structure. Styrene butadiene is developed by German chemist Walter Bock.

June 27 – The first public demonstration of color television is held by Herbert E. Ives and colleagues at AT&T's Bell Telephone Laboratories in New York. The first images are a bouquet of roses and an American flag. A mechanical system is used to transmit 50 line images to Washington. August 20 – First transmissions of John Logie Baird's experimental 30 line television system by the British Broadcasting Corporation. November – Vladimir Zworykin takes out a patent for color television. First practical coaxial cable patented by Lloyd Espenschied and Herman Affel of Bell Labs. Rudolf Hell receives a patent for the Hellschreiber, an early fax machine.

November 18 – Grand Banks earthquake: Off the south coast of Newfoundland in the Atlantic Ocean, a Richter magnitude 7.2 submarine earthquake centered on Grand Banks, breaks 12 submarine transatlantic telegraph cables and triggers a tsunami that destroys many south coast communities in the Burin Peninsula area.

October 21 – Henry Ford's Edison Institute is inaugurated at Dearborn, Michigan on the 50th anniversary of the invention of the incandescent light bulb, in the presence of President of the United States Herbert Hoover, Thomas Edison, Walter Chrysler, Marie Curie, George Eastman and Orville Wright (among others). Exhibits include the 17th century Newcomen atmospheric engine Fairbottom Bobs. Edwin Boring publishes A History of Experimental Psychology.

Kurt Gödel proves his completeness theorem. Kurt Mahler shows that the Prouhet–Thue–Morse constant is a transcendental number. Dimitrie Pompeiu poses the Pompeiu problem. Holbrook Working and Harold Hotelling devise the Working–Hotelling procedure for linear regression.

Alexander Fleming publishes an article about penicillin in the British Journal of Experimental Pathology, for which he will receive the 1945 Nobel Prize in Physiology or Medicine. Hans Berger discovers human electroencephalography. Ernst Gräfenberg introduces Gräfenberg's ring, an intrauterine device, in Germany. Clinical application of cardiac catheterization begins with German Werner Forssmann who inserts a catheter into the vein of his own forearm, guides it fluoroscopically into his right atrium, and takes an X ray picture of it. British surgeon Victor Negus publishes The Mechanism of the Larynx.

January 7 – Robert Bureau flies (and names) the first radiosonde using telemetry, in France.

Tilly Edinger publishes Die fossilen Gehirne (Fossil Brains), pioneering paleoneurology.

Robert J. Van de Graaff develops the Van de Graaff generator. Oskar Klein discovers the Klein paradox. Oskar Klein and Y. Nishina derive the Klein–Nishina cross section for high energy photon scattering by electrons. Sir Nevill Francis Mott derives the Mott cross section for the Coulomb scattering of relativistic electrons. Paul Dirac and Werner Heisenberg develop the quantum theory of ferromagnetism. Ernest Lawrence invents the cyclotron, for which he will receive the 1939 Nobel Prize in Physics. Edwin H. Land patents Polaroid polarizing film.

Sunglasses made from celluloid are first produced by Foster Grant for sale in Atlantic City, New Jersey.