672 



MR JAMES RUSSELL ON 



Table IV. 



Table V .^Shielding Ratios. — Transverse Field. 

 (See Fig. vi. and Fig. x.) 



Shield A. 



Shield B. 



H, 





H, 



H/ 



21 



33-6 



52-3 



75-0 

 100 

 130 



2-1 



2-2 

 2-1 

 2 1 

 2-0 

 2-0 



21 

 33-5 

 533 

 77-6 



103 



134 



2-0 

 2-0 

 2-1 

 2-0 

 2-0 

 2"0 



Shield A. 



Shield B. 



4-4 



(HL 



9 



H, 



(H) w - 



9 



•73 



6 



4-4 



•98 



4-5 



21 



1-40 



15 



21 



2-38 



8-8 



336 



1-71 



19-6 



33-5 



2-96 



11-3 



52-3 



2-32 



22-5 



53-3 



3-94 



13-5 



64-2 



3-05 



21-0 



64-0 



4-38 



14-6 



75-0 



3-93 



19-1 



77-6 



5'61 



13-8 



89 



5-21 



17-1 



91-7 



7-10 



12-9 



100 



6-43 



15-5 



103 



8-52 



12-1 



115 



8-95 



12-8 



117-5 



10-70 



11-0 



130 



14-45 



9-0 



134 



14-25 



9-4 



IL repeatedly reversed at each step. 



Table VI. — Shielding Ratios. — Transverse Field. — Cycle. 



Shield A. (See Fig. vm.) 



Shield B. (See 



Fig. ix.) 





H, 



(H)„ 



(H),. 



(H),„-(H) r 



g" 



H, 



(H) w 



(H), 



(H) H .-(H) r 



!?" 



78-4 



4-23 



-1-11 



5-34 



14-6 



78-5 



57 



-1-95 



7-65 



10-3 



64-6 



•863 



-1-06 



1-92 



33-6 



57-0 



■895 



- 1-82 



2-78 



20-5 



50-2 



- -343 



-1-14 



•80 



63-0 



39-4 



- -616 



-1-91 



1-30 



30-3 



35-8 - -814 



-1-17 



■36 



995 



202 



-1-95 



-1-95 







Infinite 



23-1 -111 



-1-11 







Infinite 



8-6 



-2-13 



-2-12 



- -01 





10-8 



-1-27 



-1-24 



- -03 





















-1-24 



-1-24 









- 9 



- 2 39 



- -817 



-1-57 



5-7 



-10-8 



- 1-32 



13 



-1-45 



7-5 



-20 



-2-65 



•123 



-2-77 



7-2 



- 23-3 



-1-48 



•521 



-2-00 



116 



-39-8 



-3-40 



1-16 



-4-56 



8-7 



-360 



-1-76 



•814 



- 2-57 



14-0 



-58-2 



-4-24 



1-58 



-5-82 



10-0 



- 50-3 



-2-28 



•960 



-3-24 



15-5 



-78 



- 5-55 



2-08 



-7-63 



10-2 



-64-6 



-3-08 



1-11 



-4-19 



15-4 













-78-4 



-4-23 



1-11 



- 5-34 



14-6 













Sequence observed in above determinations. 



H, 



(H)„, 



(H)< 



(H), 



H, 



Maximum value after repeated re- ) 



versals, ) 



Reading taken. 



Put off. 



Read 



ing taken. 



( Repeatedb 

 ( at maxim 



r reversed 

 um value. 



Reduced by first step, 



do. 



do. 





do. 



do 





,, „ and second step, 



do. 



do. 





do. 



do. 





„ „ second and third step, 



do. 



do. 





do. 



do. 





and so on, until zero is reached, then 















increased by steps in same manner. 















