of small Variations of Temperature on Steel Magnets. 337 



Bar B 



BarC 



BarD 



Bar E 



Percentage of 

 iron. 



98-293 * 



98-514 



98-275 



97-841 

 98 477. 



98-225 ~ 

 98-484 

 98-422 

 97571. 



f 98-639 

 \ 99-122 

 [98-265 



Mean. 



f98-453^1 

 98-581 | 

 J 98-611 I 

 1 96-764 f 

 97-575 | 

 1^98-256 J 



BarF 



N.B. These two just 

 balance each other. 

 When both are re 

 moved the mean is 

 99-125. 



98-431 \ 

 98-862 

 f 96-71 1 I 

 [ 105-221 \ 

 99-698 J 

 99-508; 



98-680 



98177 



98-675 



98030 



99- 123 



Amount of 



impurity in 



100,000 parts, 



= P. 



13200 



18230 



13250 



19700 



877-0 



We will now give the results of the magnetic determinations. 

 F = the fall for 1° C. expressed as a decimal of the deflection 

 at 20° C. 



Bar B. Bar C. 



Tempe- 

 rature. 



Deflection. 



Fall in 

 30°. 



F. 



Tempe- 

 rature. 



Deflection. 



Fall in 

 30°. 



F. 







20 

 50 

 20 

 50 

 20 

 50 

 20 

 50 

 20 

 50 

 20 

 50 



5585 

 558-0 

 554-5 

 548*' 

 543*' 

 542* 



546* 



5435 



540* 



534" 



530-7 



528-5 



1 12-2 

 1 12-8 

 i 11*5 



1 12-4 



■0 

 00 



B 







8 





 50 

 20 

 50 

 20 

 50 

 20 

 50 

 20 

 50 

 20 

 50 

 20 



308" 

 308* 

 308" 

 308" 

 3075 

 305*5 



296 



296* 



295-5 



295-5 



295" 



294" 



1 12-0 

 1 12*5 

 1 12-7 



1 12-5 



*>. 



■-* 



eo 





 O 



Mean deflection at 20° =550'7. 

 Mean fall =12-2. 



Mean deflection at 20°=307'2. 

 Mean fall =12-42. 



Phil. Mag. S. 4. Vol. 42. No. 281. Nov. 1871. 



