File:The Measurement of Magnetic Hysteresis (1902) (14592285567).jpg

Identifier: philtrans05780600 (find matches)
Title: The Measurement of Magnetic Hysteresis
Year: 1902 (1900s)
Authors: Searle, G. Bedford, T.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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es in the loadwith as little jerking as possible. Foreach cycle of loading and unloading themaximum magnetic force Hq was keptat a constant value. In every case,except possibly that of Hq = 37*4, thewire was put through several cycles oftwist in which the load varied betweenthe limits ± 2000 grammes, and thenthe magnetising current was put through20 cycles of reversal before the observa-tions for Bq and W were made. Thepositive and negative signs indicate thatthe weights were hung on the right- andleft-hand sides of the wheel respectively.In the actual experiments on the effectof torsion on Bn and W the torsion was 40000 0 always positive, the load being initiallyzero, then increasing to 2000 grammes,and then decreasing to zero. In theideal case of perfect symmetry about thestate of no torsion, the part of the curvefor negative torsions would be exactlysimilar to the part of the curve for posi-tive torsions. The results are given inthe following table, and are exhibited infig. 9 :—
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40O 800 1200 1600 2000 Fig. 9. 78 MESSES, a. P, C. SEARLE AND T. G. BEDFORD Ho = 37-4. Ho = 26-64. Ho = 15-72. Ho = 10-0. Hq- = 5-0. Load,grms. Bo. W. Bq. W. Bo. w. Bq. W. Bo- W. 0 14890 46800 13000 36400 9060 18100 4350 5310 674 190 200 14860 46900 12920 36500 8840 17620 4410 5650 690 196 400 14810 47200 12800 36600 8520 16950 3980 5070 685 194 600 14520 47400 12560 36000 8130 16180 3420 4190 677 206 800 14290 47100 12460 35600 7700 15300 3020 3760 621 165 1000 14060 46500 12040 35200 7360 14560 2840 3320 628 173 1200 13760 45700 11700 34200 7100 13950 2600 2890 602 166 1400 13540 44600 11420 33500 6800 13550 2480 2730 584 151 1600 13200 44000 11130 32800 6600 12980 2390 2540 547 130 1800 12910 43200 10850 32000 6330 12510 2260 2350 547 129 2000 12760 42300 10600 31300 6210 12050 2190 2230 556 140 1600 13210 43900 11100 32700 6520 12660 2330 2310 552 126 1200 13780 45700 11700 34100 6960 13800 2510 2610 585-^ 144* 800 14290 47000 12300 35700 7630 15230 2870 3230 635t 173t 400 14690 4

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