158 Mr. T. Andrews. [May 3, 



Table C — continued. 





E.M.F. in volt, and electro-chemical position of magnetised bar' compared with 





the unmagnetised bar, the positive or negative position of the former being 





respectively indicated by the signs + and - 









Time from 

















commence- 





Column 10. 







Column 11. 





ment of 

















magnetisa- 

 tion. 



Ferrous sulphate. 



Ferric chloride. 





Iron bars. 



Steel bars. 



Iron bars. 



Steel bars. 





J. 



II. 



III. 



IV. 



I. 



II. 



III. 



seconds. 





















a -aaa 

 u uuu 



n -aaa 

 u uuu 



A 'AAA 

 U UUU 



A - AAA 

 U UUU 



A «AAA 

 U UUU 



A "AAA 

 U UUU 



-ooo 



30 







A -AAA 

 U UUU 



A -AAA 

 U UUU 







+ 0-001 



minutes. 

















1 







A - AAA 

 U UUU 



fi 'AAA 

 U UUU 







+ 0-001 



2 

 3 







a. A 'AAAzl 

 + U UUU^fc 



A 'AAA 

 U UUU 







+ 0-001 

 + 0-002 



4 















+ 0-002 



5 



+ 0*001 



o-ooo 



+ 0-001 



0-000 



o-ooo 





+ 0-002 



6 















+ -003 



7 















+ -003 



8 















+ 0-003 



9 















+ -003 



10 



1 A .AA1 

 + u UUl 



A 'AAA 

 u UUU 



i A <AA1 



+ U UUl 



i A .AAA/1 

 + U UUU4j 



l A .AAA/1 



+ U UUU 4: 



■ A "AAO 

 + U UU4 



+ -003 



] 5 



■ a 'AA9 

 + U UU-6 



A • AA/t 

 — U UU4fc 



i A .AA1 



+ U UUl 



t A -AA1 

 + U UUl 



, A . AAT 



+ U UUl 



l A • AA1 



+ U UUl 



+ 0-002 



20 



+ U UUo 



A .AAA 



u UUU 



+ - 001 



, A . AA1 



+ U UUl 



i A • AA1 



+ U UUl 



i A «AA1 



+ U UUl 



+ -003 



25 



_l A • AAQ 



+ U UUo 



i A «AA1 

 + U UU± 



i A • AA1 

 + U UUl 



■ A • AA1 

 + U UUl 



i A ,AA1 



+ U UUl 



, a -AA1 

 + U UUl 



+ 0-003 



30 



i A . AAQ 



+ U UUo 



i A .AA1 



+ U UUl 



+ "002 



+ U UUl 



+ "002 



i A »AA1 



+ U UUl 



+ 0-003 



or 



35 



i A«AA/( 

 + U UU± 



i A .AA1 

 + U UUl 



+ "002 



, A -AA1 

 + U UUl 



i A .AAO 

 + U UUZ 



_i_ A «AA1 



+ U UUl 



+ 0-002 



40 



+ 0-004 



+ 0-001 



+ 0-002 



+ 0-001 



+ -002 



+ 0-001 



+ -002 



45 



+ 0*004 



+ 0-001 



+ -002 



+ 0-001 



+ 0-002 



+ -001 



+ -004 



50 



+ -004 



+ 0-001 



+ -002 



+ 0-001 



+ 0-002 



1-0-001 



+ 0-003 



55 



+ -004 



+ 0-001 



+ 0-002 



+ 0-001 



+ 0-002 



+ 0-002 



+ 0-003 



hours. 

















1 



+ 0-004 



+ 0-001 



+ 0-003 



+ -ooi 



+ 0-001 



+ -002 



+ 0-004 



1| 





+ '002 









+ 0-001 



+ -006 



2 





+ 0-002 



+ 0-007 



+ 0-002 





+ 0-001 



+ -005 



2| 

 3 









+ 0-002 







+ -006 

 + 0-004 



5 















+ -005 



6 







+ -003 



+ 0-001 







+ -004 



9 







+ 0-005 











12 















+ 0-003 



16 















+ 0-004 



20 









+ 0-001 









24 















+ -004 



36 















+ 0-004 



40 















+ 0-004 



44 









+ 0-006 









All the steel bars on the above table were magnetised in the coil for a short time, not exceeding 

 ten minutes in each case, so that the effects subsequent to this were due only to the retained 

 magnetism of the steel j thus there would be no Habihty to aberration from temperature causes. 



