134 Dr. S. W. Richardson on the Magnetic 



§ V. The Data obtained, and some Remarks upon them. 



Alloy No. I. 

 The first alloy investigated contained 3*64 per cent, of 

 aluminium. 



This alloy, in which the carbon was mostly in the form of 

 graphite, was comparatively soft, and could easily be turned 

 in a lathe. The other alloys, in which the carbon was mostly 

 in the form of combined carbon, were harder than the hardest 

 steel. 



A complete analysis of this alloy, as supplied by Mr. Dawe, 

 is as follows : — 



Aluminium . . 

 Combined Carbon 



Graphite 

 Silicon . 

 Sulphur 

 Phosphorus 

 Manganese 

 Copper . . 

 Chromium . 

 Iron (by difference) 



Dimensions of Ring. 



3*64 per cent. 

 0-09 

 2-40 

 2-89 

 0-007 

 1-086 

 0-301 

 0-112 

 traces. 

 89*47 per cent. 



100-00 



6-98 

 4-41 , 

 5-695 : 

 1-224 , 

 1-57 sq 



cms. 



cms. 



External diameter = 



Internal „ = 



Mean „ = 



Thickness = 



Mean section = 



Other data. 



Turns in Primary = 



Turns in Secondary = 



Mutual Inductance used in ") 

 these experiments. j ~~ 



The following readings of the induction were obtained for 

 different temperatures, the maximum field reached at each 

 reversal being maintained constant during any series of 

 observations. 



87 

 61 



1-155 xlO 6 . 



