Anders Angstrom in Uppsala Makes Spectroscopy Quantitative

Anders AngstrOm in Uppsala Makes Spectroscopy Quantitative 

Anders Jonas Angstrdm (1814-1874) became a doctor of physics in Uppsala in 1839 and professor in 1859. He carried out comprehensive pioneering work in spectral analysis. In 1868 he published a work on the sun s spectrum, a work that has been characterized as monumental. He gave there, to six significant figures, wavelengths for more than 1000 Fraunhofer lines. He used the wavelength unit 10 cm = 10 ° m. 

That unit later got the designation angstrom, A. This unit is now giving way to the SI unit nanometer, nm. 1 A = 0.1 nm. 

I have found that the spectmm of the electrical spark in fact can be regarded as two different spectra one belongs to the gas in which the discharge occurs and the second belongs to the metal or body that is the electric conductor. 

Already Wheatstone had observed that when the poles consist of different metals the spectrum is composed of lines from both metals. Because of that 

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