MAGNETIC SHIELDING IN HOLLOW IRON CYLINDERS. 



$77 



Table XIII. — Magnetic Molotrojty. (See Fig. xviii.) 

















Demagnetised by Decreasing Re- 





Denmg 



sals. 



letised by Decreasing Revei- 

 First of H c and then of H;. 



Demagnetised by Decreasing 

 sals. First of H, and then 



Rever- 

 of Be. 



versals of H,-. After this, a maxi- 

 mum value of Hi put on and then 

 put. off, leaving Residual Bj. = 



















760 to 800 C.G.S. 



H, 



BG 



Totals. 



B 



He 



BG 



Totals. 

 110 



B 



He 



BG 



Totals. 



B 



■6S 



•75 



•75 



338 



•68 



1-10 



496 



•67 



2-0 



2-0 



902 



< 



1-0 



1-05 



1-80 



812 



1-0 



1-65 



2-75 



1,240 



1-0 



2-4 



4-4 



1,980 



(3 



1-6 



5-40 



7-20 



3,250 



1-6 



5-05 



7-8(i 



3,520 



1-6 



4-9 



9-3 



4,200 



W 



2-7 



7-15 



14-35 



6,470 



2-7 



6-40 



14-20 



6,400 



2'7 



5-9 



15-2 



6,860 



X 



5-3 



Increments 



22-00 



9,930 



5-3 



Increments 



22-00 



9,930 



5-3 



6-9 



22-1 



10,000 



CO 



9-2 

 1-5 



from Zero. 



27 -90 



12,600 

 640 



9"2 



from Zero. 

 2-20 



27-90 

 2-20 



12,600 



9-2 

 1 -5 



5*8 



27-9 



12,600 





1-65 



1-65 



1-5 



850 



3-45 



3-45 



1,340 



M 



2'] 



1-60 



3"25 



1,260 



2-1 



2-20 



4-40 



1,700 



2-1 



2-90 



6-35 2,460 



R 



3 



5-40 



8-65 



3,350 



3 



4-90 



9-30 



3,610 



3-0 



4-80 



11-15 4,330 



a 



4-5 



6"20 



14-85 



5,760 



4-5 



5-80 



1510 



5,850 



4-5 



5-30 



16-45 6,380 



« 



6-8 



5*75 



20 -60 



8,000 



6-8 



5-55 



20 65 



8.000 



6-8 



5-10 



21-55 1 8,350 



f. 



8-8 



3-20 



23-80 



9,230 



8-8 



315 



23-80 



9,230 



8-9 



3-00 



24-55 9,520 



Table XIV.. — Sequence observed in the Determinations given in Tables XV. and XVI. 



Cfl 



_o 

 3 



u 

 o 



Average of Third and Sixth 



Columns, reduced to C.G.S. 



Units =(H),„. 



Ht after 

 Reversals. 



H,+ 

 Superposed. 



On Inductor 

 being rotated. 





H( after 

 Reversals. 



H r - 

 Superposed. 



On Inductor 

 being rotated. 



Left on 





 1st Increment 

 2nd do. 



,i xh do. 



Reading taken 

 do. 

 do. 

 do. 



Left on 





 1st Inclement 

 2nd do. 

 «"' do. 



Reading taken 

 do. 

 do. 

 do. 



H,, put off, Shield demagnetised by Decreasing 

 Reversals of H,. 



Ht, put off, Shield demagnetised by Decreasing 

 Reversals of H r . 



o 



3 

 o 



o 

 u 



H 



2* 



•2 "2 - 



o 111 



3) CO « 



be B tl 



2 a « 



•"ho 



H( after 

 Reversals. 



H r , repeatedly 

 reversed, superposed. 



On Inductor „ 

 being rotated. 



On Inductor 

 being rotated. 



Left on 





 1st value, left-f- 

 2nd do. do. + 

 n th do. do. + 



Reading taken 

 do. 

 do. 

 do. 



Reversed - 

 do. - 



do. - 



Reading taken 

 do. 

 do. 



H ( put off. Shield demagnetised by Decreasing Reversals of H„ 



H t - Increments 

 from Zero. 



H ( 



On Inductor 

 being rotated. 



H, 



On Inductor 

 being rotated. 



H, 



Shield by decreasing 

 Reversals of H,. 





 1st Increment 4- 



do. 

 2nd Increment + 



do. 

 n th Increment + 



do. 



Superposed 



do. 

 Superposed 



do. 

 Superposed 



do. 



Reading taken 



do. 

 Reading taken 



do. 

 Reading taken 



do. 



Repeatedly reversed 

 Repeatedly reversed 



do. 

 Repeatedly reversed 



do. 

 Repeatedly reversed 



do. 



Reading taken 

 Reading taken 



do. 

 Reading taken 



do. 

 Reading taken 



do. 



Put off 

 Put off 



do. 

 Put off 



do. 

 Put off 



do. 



Demagnetised 

 Demagnetised 



do. 

 Demagnetised 



do. 

 Demagnetised 



do. 



CT Conditions. 



CTT Conditions. 



Average Readings of each + and - increment of H c , reduced to C.G.S. units = (H) W . 



