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Range and Error of Densitometers for Emission Spectroscopy
Volume 19, Number 1 (Jan. 1965) Page 28-30
Present day densitometers are arranged to measure the proportion of the incident light that is transmitted by the photographic image of the spectral line. The readout is generally a galvanometer with a linear scale or a recorder which is also linear, although occasionally the strip chart may be printed in logarithmic units. A peculiarity of the transmission densitometer is that the measurement is inverse to usual electrical instruments in that the smaller the excursion of the needle the larger the quantity measured.