<(1800--1875)>


 * __ John Dalton __**

1766-1844 **Discovery:** 1808

John Dalton was born around September 6th, 1766 (there are no exact record that exists) into a Quaker family in Eaglesfield, England. He was the youngest of three surviving children of a Quaker handloom weaver. He attended school until age 11 and once he turned 12, he became a teacher and a public lecturer. The first paper he delivered before the society was on color blindness, which afflicted him and is sometimes still called "Daltonism." After teaching for over ten years at Kendal, a Quaker boarding school, he taught in the city of Manchester. He was an English chemist providing the beginnings of the development of a scientific atomic theory. Dalton also contributed to physics, mostly meteorology. Dalton's greatest achievement was the formulation of the atomic theory through a series if observations resulting from his preoccupation with gases. "It all began with the attempt to explaining why the constituents of a gaseous mixture remain homogeneously mixed instead of forming layers according to their density." Finally, in 1808 he published his //New System of Chemical Philosophy//.