232 ""journal of Experiments, '"Jan. 1772 



480] Sat. Jan. . Th. 53. S. H. 23. C. H. uj. 



Comparison of different substances tried in the usual way* except that in 

 the first experiment the touching wire rR and the wire RS were of brass -185 

 thick. 



Tin plate with thick touching wire. 



^ i? 378 n-45 



B - 4 i3'34 



The same plate with the common touching wire. 



Hollow tin plate, i-oi thick. 



3-71 12-20 

 B - si 14-06 



Glass covered with thick coat of tinfoil. 



B -4i 13-58 II-8 



C - 2 10-09 



- Thin coat of do. 



9-56 8 



B - 4 13-34 



gold leaf. 



B-4J 13-58 62 



C - if 9-96 



- gum. 



C 2 IO-OQ 



B-51 14-06 



Water with a little gum. 



B-44 13-58 



C - ii 9-83 



The same tin plate as before. 



C - 2 IO-OQ 



3-07 12-07 

 B - 54 i4-o6 



Th. 55 -5. S. H. 22-5. C. H. 10. 



481] Result of this and Art. 471. [Same as Table, Arts. 269, 270. 



* [Exp. iv, Art. 269.] 



