614 Prof. Richardson and Mr. Lownds on the Magnetic 



Variation of Hysteresis Loss with Temperature. 

 Limits of Field-strength +8*2 and —8*2. 



Experiments with rising 



Experiments with falling 



Temperatures. 



Temperatures. 



Temperature 



Hysteresis Loss 



Temperature 



Hysteresis Loss 



in degrees 



in ergs per 



in degrees 



in ergs per 



cent. 



c.c. 



cent. 



c.c. 



24 



2132 



21 



2092 



159 



'2019 



151 



2035 



226 



1939 



234 



1940 



311 



1733 



284 



1892 



mi 



1550 



330 



1892 



370 



1526 



354 



179o 



381 



1447 



370 



1700 



392 



1272 



388 



1502 



410 



1240 



394 



1478 



441 



1161 



428 



1383 



449 



1177 



454 



1320 



460 



1240 



471 



1335 



502 



1224 



501 



1400 



527 



1178 



544 



1368 



569 



1399 



583 



588 



582 



1178 







587 



1082 







602 



354 







042 



57 







The relation between the Coercive Force and the Tem- 

 perature is shown on PI. VI., and was obtained from the 

 following readings . — > 



Data. 



With rising 



Temperatures. 



With falling Temperatures. 



Temperature. 



Coercive Force. 



Temperature. 



Coercive Force. 



24° C. 



2-7 



21° C. 



2-9 



159 



25 



151 



27 



226 



23 



234 



2-4 



311 



20 



284 



2 3 



361 



18 



330 



23 



370 



17 



354 



2-1 



381 



16 



370 



21 



392 



1-5 



388 



21 



416 



1-8 



394 



2-2 



441 



17 



428 



23 



449 



17 



454 



2-2 



460 



1-8 



471 



2-4 



502 



20 



501 



25 



527 



2-2 



544 



29 



569 



33 



583 



24 



582 



34 







587 



36 







602 



2-2 







