Laws of the Elementary Voltaic Battery. 49 



But while there is this marked dependence of the momentary effects 

 upon the interval of repose, it is particularly worthy of observation, 

 that what we have denominated the permanent deflections, observes 

 an almost steady uniformity or decline, in an agreeable and very 

 gradual manner. The stability and regularity of the permanent de- 

 flections, are strikingly apparent, in the two last sets of observations, 

 for while in the first of these, (8) the momentary deflections are in- 

 creasing and in the last rapidly diminishing, the permanent effects are 

 seen throughout, both very steadily and slowly to decline. 



Satisfied therefore, with the accuracy of the mode of measuring 

 the action of the battery previously adopted, that is, by permanent 

 effects, we determined to repeat our experiments upon the relative 

 action of the two metals, with larger plates so as to admit of varying 

 to a greater extent the relative proportion of the two surfaces. We 

 likewise in nearly all the subsequent experiments, observed the mo- 

 mentary deflections. In these and most of the succeeding experi- 

 ments, the plates were allowed 5 minutes, repose out of the solution, 

 for we had uniformly observed that a very short interval accelerated 

 the decline of the permanent effects. 



10. New series of experiments upon the relative influence of the 

 two metals. Slips 1 inch wide, 12 inches long, and 1^ inches dis- 

 tant. Solution, sulphuric acid 1 to 94 ; quantity Ij gallon. 

 Zinc 1 inch, copper dipped to 



Vol. XXVII.— No. 1. 



