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A Leyden jar, or Leiden jar, is a device that "stores" static electricity between two electrodes on , When Guericke held his hand against the ball and turned the shaft quickly, a static electric charge built up This experiment , (Bigelow vol II p 237-253) (PDF containing extracts); ^ Jump up to: Mills, Allan (December 2008)
On-line sensors for measuring the total ball and charge level in tumbling mills , volumetric filling was assumed to be directly related to static mill filling conditions , The CSIRO acoustic sensor was installed on a run-of-mine (RoM) ball mill at.