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



in a constantly uninsulated state. This was a very Fig. 6. 

 convenient form of apparatus, and the results with 

 it were the same as those described. 



1223. In another case the ball B was supported 

 by a shell-lac stem, independently of the excited 

 cylinder of shell-lac, and at half an inch distance 

 from it ; but the effects were the same. Then the 

 brass ball of a charged Leyden jar was used in 

 place of the excited shell-lac to produce induc- 

 tion ; but this caused no alteration of the phaeno- 

 mena. Both positive and negative inducing charges 

 were tried with the same general results. Finally, 

 the arrangement was inverted in the air for the 

 purpose of removing every possible objection to 

 the conclusions, but they came out exactly the same. 



1224. Some results obtained with a brass hemisphere in- 

 stead of the ball B were exceedingly interesting. It was 1*36 

 of an inch in diameter, (fig. 7.), and being 

 placed on the top of the excited shell-lac cy- 

 linder, the carrier ball was applied, as in the 

 former experiments (1218.), at the respective 

 positions delineated in the figure. At / the 

 force was 112°, at k 108°, at / 65°, at m 35° ; 

 the inductive force gradually diminishing, as 

 might have been expected, to this point. 

 But on raising the carrier to the position n 

 the charge increased to 87°; and on raising 

 it still higher to o, the charge still further 

 increased to 105°: at a higher point still, p, 

 the charge taken was smaller in amount, being 

 98°, and continued to diminish for more 

 elevated positions. Here the induction fairly 

 turned a corner. Nothing, in fact, can better 



show both the curved lines or courses of the inductive action, 

 disturbed as they are from their rectilineal form by the shape, 

 position, and condition of the metallic hemisphere; and also 

 a lateral tension, so to speak, of these lines on one another : 

 all depending, as I conceive, on induction being an action of 

 the contiguous particles of the dielectric thrown into a state of 

 polarity and tension, and mutually related by their forces in 

 all directions. 



1225. As another proof that the whole of these actions 

 were inductive, I may state a result which was exactly what 

 might be expected, namely, that if uninsulated conducting 

 matter was brought round and near to the excited shell-lac 

 stem, then the inductive force was directed towards it, and 



