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Are-ent r ant. cavity, cons~ructe d for meas~ring . t h e initial co mplex per meability of magnetlC torolds III the very-~lgh-fre9uency region, IS described. Many of t he e lectrical and ,rnechamcal problems assOCIated wIth t he. development of an instrument of t his type are ?ons.ld ered. The gen eral t~eo ry of p el:meablhty. mea sllremel? ts, using ~ re-~ntrant c!l:vity, IS discussed, and t he assOCIated workmg eq uatIOns are d enved. CahbratlOn techmques an d results of measurements on several samples are also given.

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