Untitled timeline

Main

The Greek city-states make peace with the persian empire

449 B.C.

Battle of Samos

440 B.C.

Democritus

440 B.C.

Believed that atoms were invisible and indestructable.

Great fire in Bombay

1803

John Dalton

1803

By using experimental methods, Dalton transformed Democritus's ideas on atoms into a scientific theory.

John Dalton

1803

John Dalton made the atomic theory.

Peace of Amien ends

1803

1st horses arrive in Hawaii

1803

Ohio becomes 17th state

1803

1st major earthquake recorded in eastern U.S.

1886

1st civil rights act passes

1886

Eugene Goldstein

1886

Observed a cathode- ray tube and found rays traveling in the direction opposite to that of the cathode rays.

The American Negro Academy was formed

1897

JJ Thompson

1897

He discovered the Electron

Possibly most severe quake in historystrikes Assam, India

1897

1st olympics in U.S. are held

1904

Japan declares war on Russia

1904

Hantaro Nagaoka

1904

Suggests that an atom has a central nucleus. Electrons move in orbits like the rings around saturn.

Italy declares war on Turkey

1911

1st rescue of an air passanger by ship.

1911

Ernest Rutherford

1911

Finds that an atom has a small, dense, positively charged nucleus. Electrons move around the nucleus.

The USA introduces an income tax

1913

Floods in El Salvador kills thousands

1913

Niels Bohr

1913

In his model, the electron moves in a circular orbit t fixed distances from the nucleus.

Greece declares war on Germany

1916

Einstein's theory of general relativity represented.

1916

Robert Millikan

1916

Did experiments to find the quantity of charge carried by an electron. He ended up calculating the mass of an electron.

New York state revokes prohibition law

1923

Hitler demands "hatred and more hatred" in Berlin

1923

Louis De Brogile

1923

proposes that moving particles like electrons have some properties of waves.

Television was first demonstrated

1926

Erwin Schrodinger

1926

Develops mathematical equations to describe the motion of electrons in atoms

First flight over North Pole

1926

World War 2: Japan occupies Harbin, China

1932

James Chadwick

1932

Confirmed the existence of neutrons.

Japan and China sign a peace treaty

1932