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20-strip samples 29 gauge material 40 strips allowable experimental error approximately ballistic galvanometer connected Burrows and Fahy Burrows apparatus Burrows permeameter gives centimeter cm long cm wide coercive force core-loss test degree of uniformity difference ends Fahy permeameters Fahy Simplex permeameter fmhj given in Figure HYSTERESIS MEASUREMENTS hysteresis tests induction curve showing intercomparison iron blocks lack of magnetic magnetic circuit magnetic uniformity magnetically softer magnetizing coil magnetizing current magnetizing force corresponding maximum meameter methods middle minimum allowable width normal induction tests number of strips number of turns permeability permeam requisite degree residual induction results obtained results of hysteresis results of normal sample magnetically hard sample was magnetically samples of sheet sheet steel sooo 4000 SOOO specified specimens lay strip samples strips chosen strips selected test coil test rod test samples test specimens testing of sheet three samples three test uniform sample uniform specimen values obtained values of induction various numbers