on the Magnetic Properties of Steel and Iron. 



it IV. " English Silver Steel." Length 100mm. Three wr 



j a. Broken by a weight of 125 kgs l'48mm 51*9 



( b. Soft... 1-56 85-6 



■V J 

 I 6. Soft.. 1-E4 72-2 



So. Siil..]'fct(.'fltoastretchingweightof 30kgs. 151 76"5 



( b. Broken by a weight of 77 kgs T52 46-0 



\. 2ZZSf~«-"-*f :::::::::: Si 



Set V* Steel. Length 90mm. 



These wires were hardened as in " Set III, iron." 

 Comparing the results obtained with steel (sets IV and V) 

 we find the reverse of what we saw in the ease of iron, namely, 

 that the greatest specific magnetism occurs with the softest 



Many experiments with both steel and iron similar to those 

 already given were made, but as nothing was obtained from 

 them not contained in the above they are here omitted. 



10. Influence of the ratio of tht m* on the 



->>«:ijic muf/netm-n.—L&teT results obtained with steel, though in 

 : orating the earlier experiments, seemed at first to con- 

 tradict them. Hitherto I had observed in all cases with steel a 

 decrease of the capacity to retain magnetism with the hardening ; 

 a steel bar however, having a length of 100mm. and a diameter 

 of 7mm., gave the reverse result, its specific magnetic m when 

 soft being 100. after hardening and remagnetization 133. The 

 possibility that thr bar was iron was refuted by the hardness it 

 assumed on being heated and suddenly cooled. Experiments 

 were then made with bars of "English Silver Steel." from 

 Crooks Bros., the dimensions being the same as those of the 

 above-mentioned magnet: also in this case an increase of the 

 specific magnetism with the hardening was observed. 



Thus was proven that the increase of the magnetism in the 

 one case and the decrease in the other did not lie in the differ- 

 ent quality of the steel employed. 



