The Use of Electrets in Electrical Instruments
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An electret is a permanently electrically polarized material and exhibits an electric field near its free surface which keeps undiminished for years. It is possible to utilize this field in electrical appliances. Experiments and devices on this line are described in the following paper.
[1] A. Gemant. LXXIII. Recent investigations on electrets , 1935 .
[2] F. A. Lindemann,et al. L. A new form of electrometer , 1924 .