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What does USA stand for?

USA stands for Use of Spectrograph

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A spectrograph is an instrument that separates light into a frequency spectrum and records the signal using a camera. [2] There are several kinds of machines referred...
Definition of SPECTROGRAPH: an instrument for dispersing radiation (as electromagnetic radiation or sound waves) into a spectrum and recording or mapping the spectrum
66 The Use of the Emission Spectrograph in the Conservation Laboratory I. Introduction During the past decade, the scientific examination of works of art and