![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]()
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 PhiladelphiaAlex E. Outerbridge, Jr. · Proceedings of the American Philosophical Society · 1874