1871.] 



Metallic Surfaces in Aqueous Solutions. 



245 



the same conductor insulated ; and the bare wires can only be practically 

 worked on circuits not exceeding a mile. 



Table I. 



Two platinum bulbs about 075 inch in diameter in dilute sulphuric acid. 



Owing to the large resistance (1000 Ohms) used in R and R', the actual 

 potential is uncertain in this experiment, because the conduction across the 

 fluid reduces it. 



1. 



2. 





3. 





4. 



5. 



6. 



7- 























Potential 

















divided by 





in terms 



Duration 



Swing of reflecting 



Current 



Mean 



potential 



Approxi- 



of a cell 



of electrifi- 



galvanometer by the 



after 



minus the 



and 100 



mate capa- 



of 



cation in 



discharge of the h 



ulbs 



magnet 



remaining 







Daniell's 



seconds. 



on raising the key. 



came to 



current. 



relative 



micro- 



battery. 













rest. 





capacity 



farads. 

















for various 

 potentials. 





0-02 



10 



91 





2* 



2i 



«2 



9 





2 



1 



348 



,,' 

 0-04 



20 







2* 



9i 



■"2 









10 









4* 

 6* 





4 



1 



>< 



006 



10 







6* 





6 



1 





01 



,, 



10 

 20 





12 



11* 

 11* 





i ' 





10* 



1-05 



365 



0-16 



10 



18 



17* 



18 





iV 





16# 



1-09 



379 





20 



18 



18 



18 









02 



10 



24 



24 



24 

















20 



24 



24 



24 





II 





00 1 



1.10 



00O 



o : i 



30 



24 



24 



24 





i 









10 



59 



58 



58 





2^ 











5) 



20 



58 



57 



58 





2* 



\ 



55* 



1-39 



484 





30 



58 



58 



57 















0-6 



10 



105 



105* 



104 

















20 



105 



104 



105 







\ 



104* 



1-74 



606 





30 



104 



105 



103 















0-8 



10 



164 



163 



162 



162 













»> 



20 



162 



162 



161 









159 



1-99 



693 



lb 



30 



162 



162 



161 















10 



230 



235 



230 



230 



5 













20 



232 



231 



230 



231 





\ 



226 



2-26 



786 





30 



231 



231 

















*l-2 



30 



318 



320 



314 





14 



303 



2-53 



880 



*14 



30 



440 



446 



451 





23 



426 



3-04 



1057 



*l-6 



30 





about 603 





30. 41, 52 



562 



3-5 



1218 



* Last three readings doubtful, the current remaining after the discharge being con- 



siderable. The true reading would be greater than indicated. 







Condenser of 311 microfarads. 



0-02 





1* 



1* 



n 







H 



1-03 



311 



0-04 





3 



3 



3 







3 







0-06 





4* 



4* 



4* 







4* 



>» 





0-08 





6 



6 



6 







6 







o-io 





7* 



7* 



7* 







71 







0-2 





1*4 



14* 



14* 







14* 



l" 





0-4 





29 



29 



28* 







29 







0-6 





43 



43* 



44 







43* 







0-8 





58 



58 



58 







58 







10 





72* 



73 



73 







73 







1-6 





116 



116 



116 







116 



) ! 





2-0 





143 



143 



143 







143 







The condenser of 311 microfarads capacity- 



consisted of 24,300 square feet of metal 



surface insulated by thin paper and paraffin wax. 









