September 6, 1803 –
British scientist John Dalton (born on September 6, 1766,) begins using symbols to represent the atoms of different elements, which he considered to be the smallest parts of matter.
The idea of atoms was already known at the time, but not widely accepted. Dalton’s theory of atoms was based on actual observation. Before this, ideas about atoms were based more on philosophy.
And so it goes
The Haus of Dcaligari 