The diffusion of one gas in the stream of another in the annular space between a sleeve gland and a rotating shaft is considered. Experiments are described for finding under what conditions the distribution of concentration of the diffusing gas agrees with that given by simple theory. It is concluded that the theory is inadequate when the shaft runs eccentrically or whirls in the sleeve; the effective length of the gland can easily be halved. An attempt is made to correlate the degree of enhanced back diffusion with the factors causing it.
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