Jean Stas
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Jean Servais Stas was a Belgian analytical chemist who accurately measured the atomic weight of carbon.
Stas in an 1894 publication
Nouvelles recherches sur les lois des proportions chimiques : sur les poids atomiques et leurs rapports mutuels (1865)
Theodore William Richards
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Theodore William Richards was an American physical chemist and the first American scientist to receive the Nobel Prize in Chemistry, earning the award "in recognition of his exact determinations of th
Jean Stas
…1865). Nouvelles recherches sur les lois des proportions chimiques : sur les poids atomiques et leurs rapports mutuels. Brussels: Bruxelles. M. Hayez Theodore William Richards Law of reciprocal proportions…
Richards in 1914
Graph of periodic properties by Richards
Determinations of atomic weights, 1910