Graphs illustrate changes in resistance of gelatin and cellophane films when voltage is applied to them over a period of time and the polarity is then reversed. The similarity in these graphs, as well as other evidence, suggests that the mechanism of conduction for gelatin applies also to cellophane. Riehl's theory is very slightly modified and used to explain the results.
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C. D. Niven (1959) studied this question.
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