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The results of a study of t he number and location of the circles of zero fi eld surrounding a mul tisect ion coil are presented . The configura t ion of t he field surrounding the equatorial r egion of evera l three-section coils has been partially mapped out. One a rrange ment y ields a design in which t he mu tual-indu ctance contribution of any secondary t urn differs but li ttle from t hat of the median turn . By locating t he secondary symmetrically about the cir cles of zero fi eld , t he correction for winding distribution can be made small , an d thc effect of uncertainties in location of indi vidual secondary t urn s minimized.

A study of absolute standards of mutual inductance and in particular the three-section National Bureau of Standards type