IT. ELECTRICAL RHEOMETRY. 



Second series, half past ten o'clock. 

 Deviation of the needle determined as before = 17° 36' 



41 



For the Determination of Constant Resistance. 



Divided current — galvanometer 24° — rheostat 

 Not divided do. do. " 



Resistance r^ ....... 



Adding the galvanometer's resistance 



Constant resistance ...... 



For the Determination of Forces. 

 Second Series. 



TURNS. 



10.40 



67.00 



56.60 



1.25 



57.85 



Position of the 



Reading of the 



Total resistance. 



Ratios of 



needle. 



rheostat. 





resistances. 



centre. 



43.70 



101..58 



1.000 



2 tenths. 



47.30 



105.15 



1.035 



4 " 



58.10 



115.95 



1.102 



6 " 



86.00 



143.85 



1.416 



7 " 



105.00 



162.85 



1.603 



8 " 



172.60 



230.45 



2.329 



9 " 



406.20 



464.05 



4.570 



centre again. 



44.20 



102.05 



1.000 



9 tenths. 



400.80 



458.65 



4.740 



Third series, half past eleven o'clock. 

 Deviation determined by the said operations ^ 25° 22' 



Divided current — galvanometer 24° — rheostat 



Undivided current 

 Resistance r* 

 Adding galvanometer 

 Constant resistance 



do. 



TURNS. 



10.00 



66.60 



56.60 



1.25 



57.85 



N. B. This is identical with the preceding one ; the battery having reached its 

 maximum of strength, it remains perfectly constant for all this time. This is not 

 the first instance observed of this regularity. 



For the Determination of Forces, d 

 Third Series. 



25° 22' 



11 



Position of the 



Reading of the 



Total resistance. 



Ratios of 



needle. 



rheostat. 





resistances. 



centre. 



12.13 



69.98 



1.000 



2 tenths. 



15.85 



73.70 



1.053 



4 " 



22.00 



79.85 



1.142 



6 " 



38.80 



96.65 



1.381 



7 " 



56.00 



113.85 



1.641 



8 " 



93.50 



151.35 



2.163 



9 " 



198.70 



256..55 



3.666 



centre again. 



11.60 



69.45 



1.000 



9 tenths. 



199.30 



2.57.15 



3.590 



