At the end of 1897, Marie Curie was working in a window-lined workshop at the Paris School of Industrial Physics and Chemistry. Her focus was uranium rays, a phenomenon that was still unexplained and hadn't been studied much by the scientific community. Rather than seeking to understand the nature of the rays, Marie Curie's objective was to verify whether or not they were specific to uranium.
The unique feature of the Curie method is the piezoelectric quartz, an instrument developed by Pierre Curie and his brother Jacques in the 1880s. As a standard for measuring electric charge, it improved the accuracy of the measurements obtained by the Curies based on very low quantities of electricity.