The Measurement of Magnetic Hysteresis . pipe flame all the zinc was burnt off thewire and at the same time the wire was annealed. The wire was twisted by meansof the arrangement described in § 53. The reversing key described in § 31 was usedin these experiments. The first step was to test by the method of § 41 whether X and Y could beneglected. The numbers for this specimen, recorded in section (6) of § 41, show thatX and Y were negligible. § 57. 1^ -— ^0 Curve for Zero Stress,—To gain a general idea of the magneticcharacter of the wire, a set of observations was made to determine Bq and W fo
The Measurement of Magnetic Hysteresis . pipe flame all the zinc was burnt off thewire and at the same time the wire was annealed. The wire was twisted by meansof the arrangement described in § 53. The reversing key described in § 31 was usedin these experiments. The first step was to test by the method of § 41 whether X and Y could beneglected. The numbers for this specimen, recorded in section (6) of § 41, show thatX and Y were negligible. § 57. 1^ -— ^0 Curve for Zero Stress,—To gain a general idea of the magneticcharacter of the wire, a set of observations was made to determine Bq and W for aseries of values of Hq, the wire having been annealed and being free from strain. ON THE MEASUEEMENT OF MAGNETIC HYSTEKESIS. 79 The magnetic force was put through about 20 cycles of reversal before the tests forBq and W were made. The results are given in the following table, and the curverepresenting them is shown in fig. 10 ; the curves (1) to (5) are considered in § 65. 20000 18000- teooo 14000 12000 !0000 6000 4000 2000. Hysteesis W 8000 8000 8000 tOOOO Fig. 10. 12000 14000 16000 Hq. Bo. /x. W. Hq. Bq, /x. W. 18-75 15800 843 19400 8-0 11880 1485 10720 15-0 15190 1012 17720 6-0 9490 1582 7530 12-0 14350 1196 15580 4-0 5660 1415 3424 10-0 13380 1338 13550 3-0 2990 997 1170 Effect of Torsion loithin the Elastic Limit, § 58. The wire was found capable of sustaining 300 grammes hung from the edgeof the wheel without acquiring permanent set. We therefore decided to subject it to 80 MESSRS. G. F. 0. SEAELE AND T. G. BEDFORD cycles of torsion in which the load varied within the hinits i 300 grammes. Thechanges in the load were made by steps of 50 grammes. Before the cycle of loading and unloading, during which the magnetic observa-tions were made, the wire was subjected to several cycles of positive and negativetorsion, the load having the limits i 300 grammes. In every case, before theobservations for Bq and W were made for any particular value of the torsion, themag
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