CIRCULAR MAGNETISATIONS IN IRON TUBES. 



11 



The ratios of the inductions in these different pairs, calculated from the resistances 

 needed to be inserted in the secondary circuits so as to obtain a balance on the galvano- 

 meter, are given in the succeeding table for three different strengths of current. The 

 current strengths are given in amperes at the head of each column. The symbols A, B, 

 a, b mean the inductions produced by the axial current ; and A', B', a', V the inductions 

 produced by the sectional currents. 



Current = 



•49 



1-05 



2-09 



(1) 



BjA 



1-088 



1-0548 



1-0340 



(2) 



B'/A 



•333 



•2960 



•2898 



(3) 



BjA' 



3-60 



3-857 



3-893 



(4) 



B'/A' 



1-122 



1-077 



1-0868 



(5) 



b/a 



1-338 



1-3395 



1-3333 



(6) 



b'/a 



1-556 



•5437 



•533 



(7) 



b/a' 



3-105 



3-303 



3-404 



(8) 



b'/a'.' 



1-325 



1-340 



1-360 



(9) 



a/A 



•2735 



•2536 



•249 



(10) 



a'/A 



•117 





•0974 



(11) 



A'/a 



... 



1-080 



... 



From these the following pairs of same ratios are obtained, and final means taken of 

 these pairs. 



Current — 



•49 



1-Q5 



2-09 





1/3 



2/4 



(12) 



A'/A 



J) 



•302 



•298 



•2735 

 •2748 



•2663 

 •2667 



(means.) 



•3007 



•2739 



•2664 



2/1 



4/3 



B'/B 



•307 

 •312 



•2806 

 •2793 



•2803 

 •2792 



(means.) 



•3087 



•2802 



•2799 



5/7 

 6/8 



(13) 



a'/a 

 >> 



•431 



•420 



•4054 

 •4058 



•392 

 •392 



(means.) 



•427 



•4056 



•392 



6/5 



8/7 



b'/b 



•423 

 •426 



•4059 

 •4057 



•4000 

 •3995 



(means.) 



•424 



•4058 



•3999 



9 

 10/13 

 12/11 



a/A 



» 

 ■}■> 



J) 



•2735 

 •274 



•2536 

 •2536 



•2490 



•2485 



(means.) 



•2738 



•2536 



•2488 



