| spectrograph | An instrument used in spectography. (05 Mar 2000) |
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| spectrography | The procedure of photographing or tracing a spectrum. Origin: spectro-+ G. Grapho, to write (05 Mar 2000) |
| mass spectrograph | An instrument that subjects charged and accelerated ions (atomic or molecular) to a magnetic field that imparts a curved path that differs for each mass-to-charge ratio, thus separating individual species; used in detecting and assaying isotopic ratios and in molecular structure determinations. (05 Mar 2000) |
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