The Measurement of Magnetic Hysteresis . S. G. F. C. SEAELE AND T. G. BEDFOED The wire was placed horizontally, perpendicular to the magnetic meridian, and thetension was applied by a flexible silk cord which passed over a pulley and supporteda weight. The reversing key described in § 30 was used, the current being measuredby a shunted dArsonval galvanometer. We satisfied ourselves by the comparisonof the values of W found (1) from cyclic B—H curves, (2) by the electro-dynamo-meter, that the method was yielding at least approximately exact values of the observations corresponding to a
The Measurement of Magnetic Hysteresis . S. G. F. C. SEAELE AND T. G. BEDFOED The wire was placed horizontally, perpendicular to the magnetic meridian, and thetension was applied by a flexible silk cord which passed over a pulley and supporteda weight. The reversing key described in § 30 was used, the current being measuredby a shunted dArsonval galvanometer. We satisfied ourselves by the comparisonof the values of W found (1) from cyclic B—H curves, (2) by the electro-dynamo-meter, that the method was yielding at least approximately exact values of the observations corresponding to any given value of Hq were made, the wirewas subjected to several cycles of loading and unloading, the maximum load being24 kilogrammes. The magnetic observations were taken only as the load was beingincreased. The section of the wire was *00708 sq» so that a load of 1 kilo-gramme gives a tension of 1*39 X 10^ dynes per sq. centim. The results are given inthe following table and in fig. 7. (See also § 67.) 16000 14000 12000. Fig, 7, Observations on a soft iron wire during both loading and unloading showed thatthe curves for loading and unloading are not quite identical, though the differencebetween them is not large. ON THE MEASUREMENT OF MAGNETIC HYSTERESIS. 75 Load,kilogrammes. Ho - 4-524. Ho - 11-0. Ho - 16-24. Bo. W. Bo- W. Bo- W. 0 2 4 6 8 10 12 14 16 18 20 22 24 1233166322503030388049155475592058705750549051604840 49472611831776240231403540377038203610340030602800 57507150870010030111501173011970120001169011400110701074010410 652083201003011970131201368013500129201230011590111501063010220 866099401115012050126501298013010128201276012580123001201011720 11710137001505016300168301660016300155501508014500137801343012980 In order to save space on the diagram, the zero for the four upper curves differsfrom that for the two lower ones. The numbers on the diagram will prevent anyconfusion. In each case, as the tension increases, both Bq and W rise to maximum values,
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