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The advantages of using a double-beam system in an infra-red spectrometer are examined. An improved double-beam recording infra-red spectrometer is described and various problems attendant on the setting up and routine operation of a spectrometer of this type, with its double d.c. galvanometer-photocell amplifier and potentiometric recorder, are reviewed in detail. These include causes of instability in the amplifiers, the instrumental limitations of this type of double-beam instrument, and the effect of various factors on the elimination of spectral absorption by atmospheric water vapour and carbon dioxide.
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J. L. Hales (1949) studied this question.
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