Paris, France/parisF566

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This piezoelectric quartz apparatus was designed specifically by Pierre and his brother Jacques (1856-1941; professor of mineralogy at Université de Montpellier) to measure radioactivity at EPCI. The two brothers had given the first demonstration in 1880 of the piezoelectric effect. In the piezoelectric effect, a stress on a crystal (quartz works well) causes a voltage to be induced. In the Curies' setup, this induced voltage was used to oppose the voltage induced by the ionization chamber. The brass cover has been removed to show in the internal structure of the piezoelectric device.