416 Mr. Faraday's "Researches in 'Electricity. {Series XL) 

 App. i. Lac. App. ii. Air. 



Charge divided. 



118' 



118' 



. . . after beinjj discharged. 

 . . . . after beino; discharged. 



1261. Here 204° must be the utmost of the divisible 

 charge. The app. i. and ii. present 118° as their respective 

 forces ; both now much above the half of the first force, or 

 102°, whereas in the former case they were below it. The 

 lac app. i. has lost only 86°, yet it has given to the air app. 

 ii. 118°, so that the lac still appears much to surpass the air, 

 the capacity of the lac app. i. to the air app. ii. being as 1*37 

 to 1. 



1262. The difference of 1*55 and 1*37 as the expression of 

 the capacity for the induction of shell-lac seems considerable, 

 but is in reality very admissible under the circumstances, for 

 both are in error in contrar-y directions. Thus in the last ex- 

 periment the charge fell from 215° to 204° by the joint effects 

 of dissipation and absorption (1192. 1250.), during the time 

 which elapsed in the electrometer operations, between the ap- 

 plications of the carrier ball required to give those two re- 

 sults. Nearly an equal time must have elapsed between the 

 application of the carrier which gave the 204° result, and the 

 division of the charge between the two apparatus ; and as the 

 fall in force progressively decreases in amount (1192.), if in 

 this case it be taken at 6° only, it will reduce the whole trans- 

 ferable charge at the time of division to 198° instead of 204°; 

 this diminishes the loss of the shell-lac charge to 80° instead 

 of 86°; and then the expression of specific capacity for it is 

 increased, and, instead of 1*37°, is 1*47 times that of air. 



1263. Applying the same correction to the former experi- 

 ment in which air was ^rst charged, the result is of the con- 

 trary kind. No shell-lac hemisphere was then in the appa- 

 ratus, and therefore the loss would principally be from dissi- 

 pation, and not from absorption ; hence it would be nearer to 

 the degree of loss shown by the numbers 304° and 297°, and 

 being assumed as 6° would reduce the divisible charge to 

 284°. In that case the air would have lost 170°, and com- 

 municated only 113° to the shell-lac ; and the relative spe- 

 cific capacity of the latter would appear to be 1*50, which is 

 very little indeed removed from 1 "47, the expression given by 

 the second experiment when corrected in the same way. 



