MAGNETISM AND TWIST IN IRON AND NICKEL. 



511 



column gives the range of change of intensity due to the twisting. The areas, it should 

 be mentioned, are estimated on the supposition that the graphs are built up of straight 

 lines drawn from point to point. When the points are not too few, this cannot be far 

 wrong, inasmuch as the true graph has about equal convexities and concavities towards 

 the interior. 



Table IV. — Nickel Wire, 76 cm. long, 0*86 mm. in diameter. 



Current in 

 Amperes. 



Twist. 



Intensity. 



Lag. 



Area -+- tt. 



Kange. 



0-3 



-90° 



108 



108 







29-5 



216 





-60 



100 



85-7 



14-3 









-30 



85-1 



49-8 



35-3 













54-5 



11-6 



42-9 









+ 30 



- 11-6 



- 64-9 



53-3 









+ 60 



- 62-6 



- 93-8 



31-2 









+ 90 



-108 











0-4 



-90 



123 



123 







42-3 



245 





-60 



115 



97-7 



17-3 









-30 



97-7 



58-1 



39-6 













66-5 



- 8-5 



75 









+ 30 



3-6 



- 75 



78-6 









+ 60 



- 67-9 



-110 



43-1 









+ 90 



- 122 











0-6 



-90 



155 



156 



- 1 



55-0 



309-5 





-60 



146 



130 



+ 16 









-30 



127 



75 



52 













87-7 



- 12-1 



99-8 









+ 30 



13-4 



- 97-7 



111-1 









+ 60 



- 82-8 



-135 



52-2 









+ 90 



-1 



54 











0-72 



-90 



174 



175 



- 1 



61-4 



348-5 





-60 



163 



147 



+ 16 









-30 



144 



89-2 



54-8 













99-7 



- 17-7 



117-4 









+ 30 



+ 14-1 



-112 



126-1 









+ 60 



- 97-7 



-153 



55-3 









+ 90 



-1 



74 











0-91 



-90 



194 



194 







67-9 



387 





-60 



182 



167 



15 









-30 



165 



103 



62 













109 



- 19-8 



128-8 









+ 30 



+ 17-7 



-124 



141-7 









+ 60 



-111-0 



-171 



60 









+ 90 



-1 



93 











1-21 



-90 



213 



212 



1 



67-3 



424-5 





-60 



198 



189 



9 









-30 



175 



132 



43 













126 



- 18-5 



144-5 









+ 30 



+ 18-5 



-135 



153-5 









+ 60 



-134 



-187 



53 









+ 90 



-2 



12 











