Abstract
It has often been observed, in particular in low-temperature experiments, that spontaneous vibrations may occur in gas columns if the temperature of the tube containing the column varies markedly along its length. An explanation of this phenomenon was recently suggested by Mr T a c o n i s. This led to the present paper in which we investigate in detail the sign of the damping of the small oscillations which the gas may perform. Although we find that owing to the temperature variation there may be a marked tendency towards a negative damping of the vibrations it appears that in many cases this effect does not suffice to account for the observed instability. Its explanation has perhaps to be sought in the non-linear effects occurring in vibrations with finite amplitudes.
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