18 



LUIGI L0MBARD] 



Valori assoluti della costante magnetica. 



Sostanza 



Qualità 



10 S K 





puro 



commerciale . . 



- 13.3 



— 12.0 





puro 



commerciale . . 



— 3.75 



— 3.42 





commerciale . . 



— 1.05 



— 0.93 





» 



— 0.86 



Alluminio 



» 



+ 1.66 





in fili 



cilindri . . . 



— 1.23 



— 1.45 





in fili 



cilindri . . . 



+ 4.54 

 + 5.14 



Solfo 



in bastoni . . . 



— 0.87 



— 0.89 



Colofonio 



— 



— 0.93 



— 1.01 



Stearina 



— 



— 0.74 



— 0.82 



Spermaceti 



— 



— 0.73 



— 0.74 



Paraffina 



— 



— 0.77 



— 0.80 





— 



— 0.80 



— 0.82 



Vetro 



ordinario .... 



+ 1.35 



Fibra indurita ...... 



— 



+ 10.2 





— 



+ 34.0 



