Letter | Published:

A Simple Rotating-Cell Double-Beam Unit for Spectrometers

Naturevolume 169page1108 (1952) | Download Citation



SINCE publishing our preliminary report on this unit1, we have been able to carry out further tests upon materials having strong absorption bands in the region of atmospheric water vapour absorption. From these experiments, we have now found that our system is not a true double-beam system, since it measures the difference between the energies of the two beams, and not their ratio. Consequently the absorption due to atmospheric water vapour and carbon dioxide is not completely removed, but appears as a function of the absorption of the test material at these wave-lengths.

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  1. 1

    Goulden, J. D. S., and Randall, S. S., Nature, 169, 748 (1952).

  2. 2

    Brown, L., Holliday, P., and Trotter, I. F. (private communication).

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  1. Research Department, Biochemistry Division, Boots Pure Drug Co., Ltd., Nottingham

    • J. D. S. GOULDEN
    •  & S. S. RANDALL


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