250 



MR J. C. BEATTIE ON THE 



Plate Ib. 



Length, 



Breadth, 



Thickness, 



44-7 

 208 

 1-2235 



mm. 



^•♦<*/£>-« 



Field (about). 



Trans. Effect. 



n 



v u 



e i 



C 2 



3,864 



- -07693 



•0408 



•2019 







8,694 



- -02957 



1002 



•3165 



-•58 



+ 4-8 



16,284 



+ •15039 



•1828 



•4276 



-•57 



+ 5-1 



19,320 



+ -21259 



■2203 



•4639 



-57 



+ 4-7 



1 



The plate was next hammered and, approximately, the same field strengths used. The 

 results were now — 



ca 



(£*\ + J*S)i-± 



X V n 



:E. 



Field. 



Trans. Effect. 



A n/n J A njn 



c i 



C 2 





As in last. 



-•0126 



As in last. 







Do. 



- -05166 



Do. 



-•73 



+ 5-7 





Do. 



+ -11249 



Do. 



-•72 



+ 5-3 





Do. 



+ -19027 



Do. 



-73 



+ 5-2 





Finally, the plate was filed down, its thickness being reduced to 665 mm. which, when 

 the variation of resistance is taken into account, gives us 



c x = - -76 c 2 = +5-4. 



Field. 



Trans. Effect. 



<h 



C 2 



3,864 



- -21699 



... 



... 



8,694 



-13521 



-1-52 



10-9 



16,284 



+17013 



-1-50 



10-4 



The same results were obtained with Plate IX. It was first used when its thickness 

 was 318 mm. The constants for this were — 



(.-!= --18 c 2 = +-085. 



