192 Loomis — Effects of Changes of Temperature on 



temperature changes, his method would have given correct 

 results; hut, as will appear from the second part of this inves- 

 tigation, the ends lose a greater proportion of their magnetism 

 than does the middle, and therefore the center of magnetic 









Magnet A. 









Distance 















from 



Distribu- 



Change in 



Distribu- 



Il4 



Ig9-5 





center of 



tion at 

 14° C. 



distribu- 

 tion. 



tion at 

 99° -5. 



Induction 

 at 14° C. 



Induction 

 at 99° -5. 



Il4 - l99.0 



magnet. 



Il4 





70-1 



— 4-3 



65-8 









15*20 



428-5 



— 40-2 



388-3 



296' 



278- 



•060 



13-03 



285-4 



— 183 



267-1 



2106- 



1918- 



•089 



10-86 



204-9 



— 8-3 



196-6 



3309- 



3044- 



•080 



8-68 



146-8 



- 3-9 



142-9 



4175- 



3875- 



•071 



6*51 



91-2 



— 2-0 



89-2 



4795- 



4479- 



•065 



4-34 



56-6 



— 0-7 



55-9 



5180- 



4586- 



•062 



2-17 









5419- 



5092- 



•060 







18-6 

 — 1*7-9 



— 0-4 



o- 



18-2 

 — 17-9 



j 5498- 

 ( 5453- 



j 5169 ) 

 ( 5126 ) 



•060 



217 



— 55-5 



+ 0-4 



— 55-1 



5377- 



5050- 



•060 



4-34 



-96-9 



+ 2-5 



— 94-4 



5143- 



4818- 



•063 



6-51 



-142-1 



-f- 32 



— 138-9 



4734- 



4420- 



•066 



8-68 



— 199-9 



+ 6-2 



— 193-7 



4134- 



3834- 



•072 



10-86 



— 276-3 



+ 14-8 



— 261-5 



3289- 



3015- 



•083 



13-03 



— 432-6 



+ 39-2 



-393-4 



2122- 



1910- 



•100 



15-20 



- 69-7 



+ 11-2 



— 58-5 



294- 



247' 



•159 



attraction travels towards the middle of the magnet as the 

 temperature rises. Since the attraction varies inversely with 

 the square of the distance, and since the quantities to be deter- 

 mined are obtained by subtracting the observed quantities, it is 

 evident that the change in magnetic distribution renders Prof. 

 Wiedemann's method inaccurate. This error does not enter in 

 the present investigation, in which the magnetic moments were 



