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Keywords: SpectroscopyResearch 017.jpg The light beam was focused and defined by optics in the front room and then passed into the rear room to be collimated by the small mirror dispersed by the grating and focused by the larger mirror onto a photographic plate at Dr Reader's right National Institute of Standards and Technology 1969-08-26 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy |