Some measures of electrical-brush disintegration

So far as can be determined, the development of the concepts of wear resistance, wear resistivity, wear susceptance, and wear susceptibility as given in this paper is thoroughly new and original. These concepts are believed to be significant and useful tools that may further an understanding of the basic problems of sliding electrical contacts. For example, they offer means for making a valid comparison of brushes and brush materials insofar as wearing qualities are concerned. Moreover, they provide a clue to the proper consideration and evaluation of the large number of variables that are at work as brush disintegration takes place.