2022-06-222022-06-22195213710769https://hdl.handle.net/10657/9809It was the purpose of this study (1) to develop a vacuum tube electrometer for rapid determinations of relative characteristics of electrets; (2) to establish the effectiveness of this instrument by verifying an earlier claim that the time required for the reversal of charge on an electret increased with the temperature of the molten mixture components. Electrets were made from Carnauba wax rosin mixtures and the effective surface charge on the electrets measured by means of a vacuum tube electrometer. The method used was the discharge of a capacitor across a high resistance (10[raised 11] ohms) in the grid circuit. Curves were plotted of proportional values of effective charge versus time and the decay characteristics studied. Definite reversal times were obtained for some electrets. The reversal times for other electrets could not be obtained because of the malfunctioning of this type of instrument in relative high humidities. [...]application/pdfenThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.Thesisreformatted digital