"The ring was then centered on a steel shaft and revolved at 2000 revolutions per minute, surrounded by the "triple circuit ring." If the indicator in the "circuit ring" varied 5 degrees out of a possible 8,000, the ring had to be corrected until it varied by no more than 3 degrees, which could be considered perfect enough, since the circular tubular resonator could then hold the neutral focalization intact during the graduation of the full ninths, for sympathetic association to produce polar negative attraction." [Snell Manuscript]