Discussion on “the effect of moisture in the earth on temperature of underground cables” (Imlay), New York, February 17, 1915. (see proceedings for February, 1915)

Charles W. Davis (by letter): Soil temperature plays such an important part in determining the limiting load on cables, that any information bearing on this subject is particularly desirable. An excellent starting point for discussion of the subject would seem to be afforded by the work of Professor H. H. Callendar. I ventured to call attention to the investigation at the June, 1913 meeting of the National Electric Light Association. (See discussion of Mr. Abbott´s Report for The Underground Committee, Proceedings National Electric Light Association, page 673). And I refer to it again because it throws considerable light upon the effect of water percolating through the soil — an effect which Mr. Imlay has so skillfully made use of in a practical way; and also because it points out the errors which may arise in the determination of soil temperatures at various depths.