A spectrometer of new design is described, which makes easier the investigation of the far infrared spectra of either solids, liquids or gases. With this instrument a very high degree of resolution has been obtained and several substances have been studied from 30μ to 180μ. From 30μ to 85μ the effective slit-width was 1.04μ; from 85μ to 122μ, 1.67μ; and from 122μ to 180μ, 2.59μ.
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R. Bowling Barnes (1934) studied this question.
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