﻿when Producing a Current. 



"Ill 



A single Clark cell was used in the main circuit for the 

 reason that it is so much more steady than the usual two Le- 

 clanche cells, vide § 8. The complete results of a single 

 experiment are given in the following tahle : — 



Time. 



E.M.F. 



Temperature. 

 Oil. 



Temperature. 

 Water. 



h m 





o 



o 



11 14 



Helmholtz 6890+ 



13 



12 



12 15 



6891- 



13 



121 



2 27 



6891 + 



132 



123 



2 33 



Clark L through 147 L. ohms. 







2 36 



Clark L 9447 + 







2 37 



9447 + 







2 38-5 



94474- 







2 49 



9447 







2 59 



9446 + 







3 55 



9-1-16 







3 13 



9446- 







3 20 



9445+ 







3 29 



9415- 





124 



3 33 



Clark off 







3 35 



Helmholtz 6891 + 



13 3 







6891 + 



134 



125 



Unit E.M.F. = 



E.M.F. Clark 

 10,000 



Another set of observations is given in the accompanying 

 diagram (fig. 2). 



Fig. 2. 



Jan. 16th, 1893. Temperature 12°.— At A, the Clark cell L was short- 

 circuited by 147 ohms. At B, the circuit was broken. 



anitofE.M.F.= g* 



9990 



a 



S 



o 

 O 



9960 



| 9620 

 2 



9610 



. 















A 































o__ 



, 



1 





















i 



















1 



















j 









— *. 











1 







-<?_ 



~~^T^ 

















" TY— — 













~~* 



M 



2h.S0m. 



3h. 



Time. 



3.20 



3.30 



3.46 



The four experiments made by this method gave an average 



