The paper by J. C. Jaeger discusses the temperature distribution at sliding contacts due to moving heat sources. It addresses the challenges of calculating temperatures in sliding or cutting contacts, where the nature of the contact and wide range of parameters make systematic study difficult. The paper presents mathematical solutions for various types of moving heat sources, including band and rectangular sources, and discusses their temperature distributions in semi-infinite media. It also considers the effects of varying source strength and velocity, and provides numerical calculations for specific cases. The paper concludes with an analysis of the average and maximum temperatures over the area of the source, and discusses the practical implications of these results for understanding heat generation in sliding solids. The results are applied to the problem of surface temperature in sliding solids, where the heat generated by friction is distributed between the sliding body and the surface it slides on. The paper also considers the effects of varying source strength and velocity, and provides numerical examples to illustrate the results. The paper concludes with a discussion of the practical importance of the results, particularly in the context of heat generation in sliding solids.The paper by J. C. Jaeger discusses the temperature distribution at sliding contacts due to moving heat sources. It addresses the challenges of calculating temperatures in sliding or cutting contacts, where the nature of the contact and wide range of parameters make systematic study difficult. The paper presents mathematical solutions for various types of moving heat sources, including band and rectangular sources, and discusses their temperature distributions in semi-infinite media. It also considers the effects of varying source strength and velocity, and provides numerical calculations for specific cases. The paper concludes with an analysis of the average and maximum temperatures over the area of the source, and discusses the practical implications of these results for understanding heat generation in sliding solids. The results are applied to the problem of surface temperature in sliding solids, where the heat generated by friction is distributed between the sliding body and the surface it slides on. The paper also considers the effects of varying source strength and velocity, and provides numerical examples to illustrate the results. The paper concludes with a discussion of the practical importance of the results, particularly in the context of heat generation in sliding solids.