The London, Edinburgh and Dublin philosophical magazine and journal of science . B at the Tabic III. For eachdifferent temperatures K 2 132 Mr. E. L. Wills on the Efect of were obtained from the B —H curves and the correspondingvalues o£ the hv iteresis found from fig. 8. Fiff. 8. .30000 /I5C 25000 ^00c /256C f / / /315C 15000 // // / Y / / /,364°C /// / /\ /4-l2°C 10003 / / / / 4-72° C s^s* H°C 5000 / ^ 604° C ^^^^^^^^^r648C 2OO0 6000 8000 10000 Fig. 9. ^12500£ 10000 |.500 1 ^ 5000 \ VA >& \ X x^ ^ JQOc * £00° 300° 400° 500° T£MP£ffATUfl£, /A/ D£QffC£S C£/VT/G/?J0£. 600 700 Two of these cu
The London, Edinburgh and Dublin philosophical magazine and journal of science . B at the Tabic III. For eachdifferent temperatures K 2 132 Mr. E. L. Wills on the Efect of were obtained from the B —H curves and the correspondingvalues o£ the hv iteresis found from fig. 8. Fiff. 8. .30000 /I5C 25000 ^00c /256C f / / /315C 15000 // // / Y / / /,364°C /// / /\ /4-l2°C 10003 / / / / 4-72° C s^s* H°C 5000 / ^ 604° C ^^^^^^^^^r648C 2OO0 6000 8000 10000 Fig. 9. ^12500£ 10000 |.500 1 ^ 5000 \ VA >& \ X x^ ^ JQOc * £00° 300° 400° 500° T£MP£ffATUfl£, /A/ D£QffC£S C£/VT/G/?J0£. 600 700 Two of these curves for H = 598 and 7*97 respec-tively are shown in fig. 10. It will be seen that throughouta considerable range of induction the hysteresis is a linear Temperature, on the Hysteresis Loss in Iron. 133 function of the induction. As in the case of iron, thehysteresis losses, for very small inductions, are larger thanthose given by the equation, and as the induction increasesbeyond about 6000 the hysteresis increases less rapidly to a Fiff. maximum value. Then, as the temperature is raised, thehysteresis falls while the induction is still , the hysteresis and induction both decrease veryrapidly. For the straight part of the curve the equationgiving the hysteresis as near as can be determined isW = -l4HS8B —1000. The smaller the magnetic force thehigher the temperature at which the maximum hysteresisoccurs ; and, as in the case o£ iron, this temperature for anymagnetic force is practically the same as that giving themaximum permeability with the corresponding magneticforce. In conclusion I wish to express my thanks to ProfessorJ. J. Thomson for useful suggestions and kindly interestduring the progress of the work, and to Mr. G. F. G. Searlefor help in the preliminary experiments. Cavendish Laboratory, Cambridge. 1M [ 134 ] VI. On the Conditions necessary for Eqidpartition of Energy.(Note on Mr. Jeanss Paper^thil. Mag. November
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