298 



Magnetic Moments of Steel Magnets. 



Table I. 



-i-3 

 © 



C3 



a 

 en 



o 



© 



a 



ap 



El 



o 



in 

 03 



a 



igth and diameter 

 magnet, in centi- 

 metres. 



o 



+-> 



"So u 



a © 

 © +2 



i-H © 



o § 



O r3 



© 



H 



o g 



§ a 



n 



© ^ 



© U 

 g © 

 60 P* 



Percentage loss of Magnetism due to 

 percussion after lying aside for dif- 

 ferent periods of time before being 

 experimented upon. 



3 



1 44 20 



1 



3 





Hi ° 



tf 



£ 



g 



months. 



month. 



hours. 



hours. 



hour. 



1. 



f Glass- 1 

 1 hard, j 



10 X -3 



33 



5-200 



41 



0-8 



104 



1-94 



20 



1-98 



2. 



10 X -2 



50 



2-084 



45 



0-0 



1-00 



1-48 



3-2 



2-96 



3. 



Yellow. 



10 X '3 



33 



5-195 



44 



6-2 



5-4 



4-8 



6-1 



6-03 



4. 



„ 



10 X3 



50 



2-087 



46 



4-0 



2-6 



3-76 



3-5 



4-0 



5. 



Blue. 



10 X -3 



33 



5-240 



54 



7-5 11-8 



971 



10-8 



11-8 



6. 



» 



10 x -2 



50 



3-095 



71 



8-7 7-5 



8-18 8-2 



8-2 



Table IT. 

 The Magnets in this Table were all tempered Glass-hard. 



■4 



5-1 1 



© d 



IS 



o 



+3 



© 



43 > 

 33 ** 



Percentage loss of Magnetism 



SP 



-U3 



sps 



la 



due to percussion 



after fall- 



a 



H3 +=" 



Sh ® 



a 1 



© g 



ing the number 



of times 



■s 



©■ 



£ a § 



42 "S 



^ a 



O o3 



o ^3 



O £ 

 3 M 



specified. 









a 



bc-^, a 

 g °"^ 

 hi 



+3 



© 



3P* 

 3 



1 time. 



3 times. 



Total loss. 



1. 



15X-25 



60 



5-73 



56 



•67 







•67 



2. 



15x-25 



60 



5-66 



55 



•65 







•65 



3. 



10 X -3 



33 



5-25 



40 



•46 







•46 



4. 



6X-3 



20 



3-08 



36 



1-1 



•73 



1-83 



5. 



3-2 x -3 



10 



1-66 



27 



•7 



•7 



1-4 



6. 



10 x '2 



50 



2-82 



43 



•43 



•11 



•54 



7. 



7x-2 



35 



1-97 



39 



2-1 







21 



8. 



lOx-15 



70 



1-39 



65 



105 







1-05 



9. 



7X-15 



47 



0-98 



57 



1-2 



1-2 



2-4 



10. 



iox-i 



100 



0-56 



.66 







1-8 



1-8 



11. 



7x-1 



70 



0-39 



64 















By inspection of Table I., we see that in the case of the 

 two glass-hard magnets the percentage loss diminishes the 

 longer they are left undisturbed before they are subjected to 

 percussion ; it would also appear that the smaller the dimen- 

 sion ratio the greater is the loss. 



The other four magnets, so far as the experiments go, 

 appear to show that the greater the amount of annealing the 

 greater is the loss ; the observations, however, have not been 



