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U.S.S.R. Protection of Main Pipe‐Lines. The effect of a current arising from continuous current transmission lines was assessed on the difference of pipe‐earth potential and on strength of current in the pipelines. Curves were adduced based on the formula for determining the transitional resistance of a pipeline under these conditions, as were curves for dependence of constant diffusion of continuous current along a pipeline on its transitional resistance, at various specific ground resistances. Theoretical calculations were carried out of the difference in pipe‐earth potentials and current strengths on a section of the gas main from Saratov to Moscow. A graph was constructed of the dependence of difference in pipe‐earth potentials on the distance between the pipeline and the grounding; also a graph of the dependence of current in the pipeline on that distance, and a graph of the dependence of difference in pipe‐earth potentials and of current strengths in the pipeline upon specific ground resistance. Differences in potential and current strengths with voltages of up to 1,000 v. and current at 20 amp. in the transmission lines were examined.