I am trying to get a better idea of how Dalton came up with his values of atomic weights for various elements. I know that he used ratios of gas mixtures and I've read about CO, CO2 and CuCO3 (with the a 3 to 4 ratio of C to O). I would like to see many of his specific examples using his ratios, but I can not find this spelled out clearly anywhere on the web. Can anyone shed some light for me? Thanks!