32 DR. FARADAY'S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XI.) 



1-38 as the expression for the glass appai-atus, then the specific inductive capacity of 

 flint glass will be above 1*76, not forgetting that this expression is for a piece of glass 

 of such thickness as to occupy not quite two-thirds of the space through which the 

 induction is sustained (1273. 1253.). 



1275. Sulphur. — ^The same hemisphere of this substance was used in app. ii. as 

 was formerly referred to (1242.). The experiments were well made, i. e. the sul- 

 phur itself was free from charge both before and after each experiment, and no action 

 from the stem appeared (1203. 1232.), so that no correction was required on that 

 score. The following are the results when the air apparatus was first charged and 

 divided : 



App. i. Air. 



App. ii. Sulphur. 



Balls 280°. 



438 

 434 



164 



162 



Charge 



0° 



divided. 

 . 162 



. 160 



after discharge, 

 after discharge. 



Here app. i. retained 164°, having lost 270° in communicating 162° to app. ii., and 

 the capacity of the air apparatus is to that of the sulphur apparatus as 1 to 1*66. 

 1276. Then the sulphur apparatus was charged first, thus: 



0= 



237 



0° 



.... 395 



.... 388 

 Charge divided. 



.... 238 



after discharge. 



. . . . after discharge. 



Here app. ii. retained 238°, and gave up 150° in communicating a charge of 237° to 

 app. i., and the capacity of the air apparatus is to that of the sulphur apparatus as 

 1 to 1'58. These results are very near to each other, and we may take the mean 1-62 

 as representing the specific inductive capacity of the sulphur apparatus ; in which 



