Recent advances in the field of anomalous dispersion

At no time has there been such an urgent need for an understanding of the chemical and physical behavior of matter as in the present emergency. With the unusual demands that have been made in the various applications of insulation material and of the allied electrical equipment, together with the refinements in apparatus stimulated by needs in the present war and equivalent applications, a fuller knowledge of the electrical behavior of matter is all the more essential. The situation has also become more involved with introduction of many new materials such as in the plastic and related insulation field to meet the needs which never have existed on such a scale as the present. Some of these new materials have been prompted as substitutes and others have resulted from modifications in processing. It is gratifying to note that contributions in the field of anomalous dispersion, though limited in number, reflect the distinct progress toward this much needed understanding of insulation material. Such information has enabled a better classification and evaluation of the sundry materials and should serve as a guide toward better processing and control in preparing materials.