His contribution to science was the quantitative justification of the concept of atomic number by means of Moseley's Law. In advanced chemistry he provided fundamental support for Bohr's atomic model defined in detail by Rutherford and Antonius van den Broek, mentioning that atomic nuclei contain positive charges equal to their atomic number.
International: A fire destroys almost the entire city of Panama.
National: The strike of Cananea breaks out in Sonora
