Dielectric losses in condensers

A comparative study of the methods which are used in measuring dielectric loss in condensers, especially those having a large value of capacitance is being made by the Bureau of Standards, which has an air condenser with a capacitance of 1/10 of a microfarad which will withstand 3000 volts without any appearance of corona. The losses in other condensers may be compared with this air condenser which has negligible loss by means of bridge methods. This is not only the most accurate and dependable method of measuring dielectric loss but also is one of the simplest when there is available a condenser having known losses.