3*4 



On Resistance to Electric Current 



Exp. 10. Saturated solution compared with salt in 69 in same tubes. 



23 



22 



[R. = 65000.] 



3-1 24-9 sensib. less. Electrom. = i. Th. = 63. 

 1-9 as much greater. 



Therefore sat. solut. conducts 9-02 better than the solution in 69. 



619] Examination whether salt in 69 conducts better when warm than when cold. 



Salt in 69 in tube 17 placed in water; solution in 29 in tube 23 out of water, 

 the distance of wires in tube 17 being not measured, but remaining always the 

 same. 



Electrometer = f . 

 23 



8-1 . sensib. less 



5 about as much greater) 



4 plainly less ) . , , 



v heat of water = 105. 

 2-6 as much greater j 



Therefore salt in 69 conducts 1-97 times better in heat 105 than in that 

 of 58J*. 



620] Examination whether the proportion which conducting power of sat. sol. 

 and salt in 999 bear to each other is altered by heat. 



Sat. sol. in tube 15, salt in 999 in tube 19, both in water; distance of wires 

 in tube 15 not altered. 



19 Electrom. = 



r} h 



of water = 58 J. 



3-25 

 2-15 

 2-25 



3'5 



sensib. less \ 



sensib. greater) 

 just sensib. greater 



heat of water 50. 



electrom . = i. 



rather more sensib. less) heat of water 95. 

 Therefore the proportion seems very little altered by heatf. 



621] Jan. i, 1777. Salt in 2999 of water compared with water distilled in 

 preceding summer in tubes 12 and 20. 



Electrom. = 4^. 



20 





1-4 



12 



43 - 5 rather greater. Column of 1-6 in tube 20. 



plainly less. Supposed equal to 43-5 in tube 12. 

 greater. 



Therefore allowing for different bores of tubes, salt in 2999 conducts 24 

 times better than distilled water. 



* [By the experiments of Kohlrausch, this ratio would be 1-59. See Art. 691 

 and Note 33.] 



| [This agrees, with the results of Kohlrausch.] 



