56 On the Magnetizing- Function of Soft Iron, 



and, finally, 



£=103-33, 11=15-57. 



The results of ray measurements are collected in the folio win* 



Table :— 



R. 



k. 



R. 



k. 



R. 



*. 



R. 



*. 



4-302 



21-54 



1647 



113-5 



83-26 



1200 



195-7 



61-93 



5-497 



23-78 



2321 



157-0 ! 



91-40 



112-2 



i 205-9 



59-22 



7-017 



26-4-1 



32-12 • 



174-2 : 



100-35 



1081 



! 217-0 



56-47 



9-220 



40-95 



35-62 



172-3 ! 



10503 



104-2 



i 228 



53 92 



10 53 



51-10 



38-14 



1707 i 



111-18 



97-12 



i 235-8 



52-88 



11-51 



59-76 



40-38 



1689 i 



119-6 



93-97 



| 252-2 



49-68 



12-60 



68-70 



52-47 



161-6 ! 



132-6 



87-70 



272-7 



47-29 



13-67 



76-53 



67-89 



141-7 ' 



1401 



82-08 



1 288-2 



44 04 



14-94 



8453 



71-83 



136-2 



1560 



75-43 



i 296-1 



43-65 



15-60 



104-48 j 



75-55 



132-1 ! 



179-3 



66-87 



307-3 



42-13 



From these data the continuous curved line in fig. 6 is drawn ; 

 its abscissa? represent the values of R, and its ordinates the cor- 

 responding values of k. The two dotted lines are drawn after 

 the above-calculated series of experiments of Von Quintus Icilius. 

 We see that at the higher values of B, the course of all three 

 curves is very similar, while at the lower values the curve ob- 

 tained by me has a much steeper ascent. 



As is well known, the number k varies when the temperature 

 of the iron undergoes considerable variations. This temperature, 

 in the case of my ring, could not be stated exactly. The tempe- 

 rature at the place of observation sank considerably during the 

 time the investigation was proceeding (September and October 

 1871) ; but this was partly compensated by my using gradually 

 more and more powerful decomposing forces, so that the ring 

 was more and more heated by the primary current (partly also, 

 perhaps, by the remagnetizing itself); therefore most of the 

 measurements refer to 15°-20° C. A considerable augmenta- 

 tion of k appeared only when once, towards the close of the in- 

 vestigation, I intentionally caused the current from 14 zinc- 

 carbon elements to pass through the primary wire until it was 

 heated from 10° to 40° ; the results of such experiments are not 

 comprised in the Table. 



With certain arrangements for the positive determination of 

 the temperature of the iron, similar methods could be employed 

 for the investigation of the influence of temperature on the mag- 

 netizing-f unction. It would moreover be desirable to extend 

 such measurements to various sorts of iron, in which the course 

 of k might exhibit considerable deviations. It would also be to 

 the purpose to make use of thinner rings for the measurements 



