178 Mr. C. Binks on Electricity , 



and that at 2 inches distance, the amount goes on increasing 

 by each addition to the plate, till it reaches 170", which is 

 given by a plate of 18 square inches, or one about 9 times 

 larger than that needed at the first position, and 4 times larger 

 than that needed at the second. 



150. But beyond these distances, the amount is not ob- 

 tained by any addition to the size of the plate. At 4< inches, 

 the next position, occurs the singular appearance of the great- 

 est amount of action, 205", which occurs throughout the range 

 of plates at that distance, being produced by a plate small in 

 size compared with many employed in it. This is yielded by 

 a plate of 24- square inches, whilst others larger and ranging 

 between 24 and 72 square inches give a less amount. 



lol. The same phenomenon occurs at the remaining di- 

 stances, but to a different extent, and by different sized plates 

 in each. These particular numbers in each column, wherever 

 the amount sought for is not obtained, are considered as those 

 making the nearest approach to that amount ; and constituting 

 as they do valuable data for future reasoning, they are those 

 distinguished in the table by a star, and by the dotted lines in 

 the subjoined diagram. 



Table (No. 9). 



152. The same as before in all respects, except the strength 

 of the acid mixture, which is 1*090 specific gravity. 



153. We perceive that throughout this table the same ge- 

 neral phaenomena are presented as in the former one, differ- 

 ing only in degree; an effect which must be attributed to the 

 difference in the strength of the acid mixture, that being the 

 only condition of the general arrangement in which any change 

 has been made. 



154. The standard amount of action 55", is here regained 

 at the 3 several positions 1, 2, and 4 inches distance ; whereas 

 in the other case, it was regained only at the two first. And 

 the plates so required to reproduce this standard amount are 

 of a larger size comparatively, but appear to increase by a re- 

 gular progression, as in the former instance. 



