Excerpt from Piezo-Electric Activity of Rochelle Salt Under Various Conditions
This after-effect does not persist very long but dies Off exponentially with the time. The piezo-electric response or ballistic throw Of the galvanometer for 250 grams has been Observed to return to half value in 1 minute and to normal in over 20 minutes after fields Of 150 volts have been applied for 3 minutes previously. There is a much greater after effect in the direction Of increased activity.
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