3 1 6 On Resistance to Electric Current 



622] Examination whether comparative resistance of salt in 2999 and salt in 

 150,000 was the same when tried in the above-mentioned manner, or when passed 

 through 2 wires in glass of wafer, as in fig. * 



Jan. 6. The tubes 12 and 20 filled with salt in about 105 of water: salt in 

 150,000 of water in glass. 2 jars electrified to if and communicated to the rest. 



oo.e flcSS 



If the distance of wires in tube 12 was the shock was sensibly { 



18-5 ' (greater 



than that through the wires in glass. 



The same tried as before, only with the jars electrified to 2 and the shock 

 received with shock melter*. 



If the distance of wires in tube was f ^ ^ shock was plainly / than 



\2O-3 i greater 



through wires in glass. 



The glass filled with salt in 2999 and the shock compared with that through 

 tube 20 with same solution of salt in 105. 



The jar electrified to 2 and received with shock melter f. 



If dist. wires in tube 20 was / shock was (f r than through wires 



\i- \less 



in glass. 



N.B. Great irregularity was found in trying this last experiment, the cause 

 of which I am unacquainted with. 



Therefore salt in 2999 conducts 31-5 times better than salt in 150,000. 



The same salt in 150,000 which was used in this experiment was saved and 

 compared with salt in 2999 in the usual manner with tubes 12 and 20, electro- 

 meter at 4^. 



( T2 I PTf 1 3.tf i r 



If distance of wires in tube 20 was -! shock was plainly -! than 



^1-85 (.less 



through tube 12 with wires at 42-4 inches distant. 



Therefore salt in 2999 conducts 24-6 times better than salt in 150,000. 



The thermometer in all the foregoing experiments of this year supposed to 

 be about 45. 



623] Exp. ii. Saturated solution in tube 14 compared with salt in 149 of water 

 in tube 15. 



Tube 15 



1-6 

 2-6 



41-8 



Electrometer at 3^. Th. = 45. 

 [R. = 474000.] " 



sensib. greater, 

 sensib. less. 



Sat. sol. conducts 20-5 times better than salt in 149. 



* [See figure in facsimile of MS. on opposite page.] 



f [The reading here is doubtful; see facsimile of MS. on opposite page. Cavendish 

 says, Arts. 601, 602, 616, that he took the shock with metals in each hand, but the 

 word here cannot be read "metal." The word occurs also in Arts. 585 and 637.] 



