as a Source of small Constant Currents. 



361 



In Plate XIII. corresponding curves are drawn when the cell 

 is yielding a current of nearly 0*01 ampere. They are drawn 

 from observations taken on July 26 with a resistance short- 

 circuiting the terminals of the large cell of 143 1. ohms. 

 (See Table I.) 



Table II. 



Variations of terminal P.D. with time when large Clark cell 

 is short-circuited through 1423 1. ohms. 



A is the terminal P.D. immediately before changing the 

 resistance between the poles from go to 1423 l.o. minus 

 the terminal P.D. at the times given in the 2nd column. 



Date. 



Time. 



A. 



Resistance between Poles. 



1888. 

 July 24. 



(1.) 



h m s 



3 30 



30 20 



32 



35 

 37 

 40 

 45 

 51 



volts. 



0-000000 



+0-004095 



+0-004815 



steady at this. 



Changed from oo to 1423 1. 

 1423 [ohms. 

 1423 



Changed to oc . 



CO 

 CO 

 OO 

 00 



+0-000595 

 +0-000405 

 +0-000360 

 +0000360 



July 24. 

 (2.) 



3 57 

 57 20 

 59 



4 2 



4 



5 



6 



7 

 7 20 

 9 



10 

 12 

 15 

 23 



ooooooo 



+0-004635 

 +0004500 

 +0-004500 

 +0-004500 

 +0 004500 

 +0-004500 



Changed from co to 1423 1. o. 



1423 



1423 



1423 



1423 



1423 



1423 

 Changed to co . 



OO 

 CO 

 OO 

 00 

 00 

 00 



+0000135 



o-oooooo 



-0000045 

 -0-000090 

 -0 000135 

 -0000135 



July 26. 

 (3.) 



3 7 



7 20 



8 55 



10 



11 45 



12 



13 10 



14 20 

 16 



0-000000 

 +0-005805 

 +0-006030 

 +0-006120 

 +0-006120 



Changed from oo to 1423 1. o. 



1423 



1423 



1423 



1423 

 Changed to co . 



CO 

 CO 

 00 



+0-000405 

 +0000315 

 +0-000315 



