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The work reported here is consistent with, but not conclusive proof for, the coupling theory of eddy diffusion. The proof of this theory would be greatly advanced if it were possible to show the actual variation of A with flow velocity. This would be enormously difficult using the ordinary gas chromatographic methods. Glueckauf (17) has shown this kind of variation in a liquid system but it is difficult to judge the reliability of his data. The fact that the classical eddy diffusion picture seems to work in chemical engineering studies, many in the proper range of Reynolds numbers, indicates that the predicted transistion with velocity occurs at some point. The authors are not familiar with any experimental work which is in significant disagreement with the coupling theory.

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A programmed temperature gas chromatograph is described for the rapid separation of mixtures of wide boiling point ranges. Linear heating