Properties of an Extensive Series of Alloys of Iron. of 
accompanying H and B curves, fig. 1, only a low maximum induction can be 
imparted to this alloy even in the highest fields) The unannealed alloy being 
somewhat harder is much less permeable in low fields; but when the field exceeds 
5000 
4.000 ee eee inh Un-aynea 
ee 
Reese Cee 
L000} } 
/ 
| COVE eS eee eer 
20 16 12 8 4 (a) 4 “8 12 1§ 20 24. 28 ays Sf) 0) 44 48 
Fic. 1.—Upper part of cyclic curves of 31 per cent. nickel-iron alloy. 
6 C. G. 8. units, a greater intensity of magnetisation is produced in this unannealed 
alloy : hence the apparent anomaly shown by this specimen in Table II. 
(2) Wenow come to the stlicon-iron alloys. Here, as will be seen from Plate I., 
the permeability in a field of 8 is greater than iron if the silicon does not exceed 3 per 
cent., judging from the few specimens which we have at our disposal. In order to 
CTT Ee 
PL eae 
Eas eet 
16000 
(= eae ee 
fees ee | a ea 
0 DOR Mite SO} ~~ 40 Teed os 
50 
Fic. 2.— Permeability curves determined by Ewing’s Bridge. 
