spectrograph

Etymology

spectro- + -graph

noun

  1. A machine for recording spectra, producing spectrograms.
    Diesel maintenance schedules are benefiting from work done on the magnificent Hilger & Watts electronic spectrograph for oil analysis, which detects minute quantities of metals in samples of used lubricating oil; …. 1960 June, “Talking of Trains: New B.R. research laboratory”, in Trains Illustrated, page 329

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