Electrical Spectra of Metals. Results of an Examination as to the Practicability of Assaying Metals Used in Coinage, by Means of Spectrum Analysis, Made in and for the Assay Department of the U. S. Mint at Philadelphia
Alex E. Outerbridge,. "Electrical Spectra of Metals. Results of an Examination as to the Practicability of Assaying Metals Used in Coinage, by Means of Spectrum Analysis, Made in and for the Assay Department of the U. S. Mint at Philadelphia." Proceedings of the American Philosophical Society 14.92 (1874) 162-173