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Keywords: SpectroscopyResearch 006.jpg Arc spectra of copper top over wavelength range of 3400 to 3860A; standard tungsten lamp spectrum bottom at 50A intervals Both recorded through a rotating stepped sector National Institute of Standards and Technology 4/3/1961 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy |