Determination of the degree of uniformity of bars for magnetic standards . Magnetizing Coil wvw (A/ Fig. 2.—Diagram of apparatus for the determination of magnetic uniformity along Die length of a straight bar the two coils connected in opposition, the deflection on reversal isproportional to the difference in induction between the parts ofthe bar under the two coils. This difference divided by thedistance between coils is the average leakage over that leakage data taken at equal intervals along the length of thebar the ordinates of the uniformity curve are calculated, andthese poin
Determination of the degree of uniformity of bars for magnetic standards . Magnetizing Coil wvw (A/ Fig. 2.—Diagram of apparatus for the determination of magnetic uniformity along Die length of a straight bar the two coils connected in opposition, the deflection on reversal isproportional to the difference in induction between the parts ofthe bar under the two coils. This difference divided by thedistance between coils is the average leakage over that leakage data taken at equal intervals along the length of thebar the ordinates of the uniformity curve are calculated, andthese points are plotted against displacement along the bar. A continuous record for the whole length of the bar is possibleby a modification of the apparatus. If the opposed test coils aremoved at a uniform rate along the bar, the emf induced is pro-portional to the rate of change of leakage along the bar. This Bulletin Bureau of Standards, Vol. 14. Fig. 3.—Apparatus for the determination of magnetic uniformity along the length of a straight bar sanford] Magnetic Uniformity 5 emf is constant for a uniform bar and variations indicate non-uniformities. It is possible with suitable apparatus to obtain aphotographic record showing the degree of uniformity along thelength of a bar. The choice of the induction at which to make uniformity deter-minations is of considerable importance. If the induction is car-ried too high, the effect is to raise the value of the ordinates of the
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Keywords: ., bookcentury1900, bookdecade1910, bookiddete, booksubjectmagnetism
