Scientific and Technological Events from 1900 C.E. to 1949 C.E.

© Copyright Andy Pepperdine, 2007 - 2010

Some of these entries need cross-checking against more citations.


Date

Science events

Political events

1900

Planck finds that energy is issued in discrete quantities, the start of quantum theory.


1901

First Nobel prizes awarded according to the will Nobel wrote in 1895.

1903

Wright brothers make the first powered controlled flight.


1905

Einstein publishes 3 ground breaking papers on the photo-electric effect, special relativity and Brownian motion


1911

Rutherford describes the atom as a nucleus surrounded by electrons. The assumption it contained protons emerged over the next decade.


1913

Schick finds a test for diphtheria immunity.

Bohr publishes his theory that electrons are constrained to certain orbits round the nucleus in atoms.


1914


First World War breaks out

1915

Einstein publishes theory of General Relativity showing how space itself can be used to explain the effects of gravity.

Wegener publishes The Origin of Continents and Oceans introducing his theory of continental drift.


1917

Freud publishes first part of Introductory Lectures on Psychoanalysis, explaining his ideas.


1918


End of First World War on Armistice Day (11 November)

1927

Heisenberg expounds his Uncertainty Principle stating that it is not possible to simultaneously know accurately both position and momentum of a particle.


1928

Fleming discovers penicillin, although he failed to follow it up at the time.


1929

Hubble successfully argues that the universe is expanding, thus supporting Lemaître's theory of 1927

New York stock exchange drops precipitately due to large numbers of small investors overreaching themselves, leading onto the Depression of the 1930s.

1930

Pauling uses quantum theories to explain chemical bonds.


1932

Chadwick announces the discovery of the neutron in a letter to Nature.


1939


Second World War breaks out when Hitler invades Poland.

1945

First atomic explosion conducted.

End of Second World War when Japan surrenders after the first atomic bombs are dropped in anger.

1947

Shockley, Brattain and Bardeen invent the transistor.



References


© Copyright Andy Pepperdine, 2007 - 2010

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