Experiments with Grove’s Battery. 391 
Miles. 1 2 3 4 5 
SODVHOUR OME 
I 
Table constructed from the Curve. 
Inches. 
Battery alone - - - - 5.20 
90 One mile - - - - - 3.85 
Two miles - - - - 2.62 
Three ‘ - - - - 184 
Hour...“ Sislinpies - - 1.20 
Bive «. .% - - - - 1.05 
S1x & - - - - .92 
30 Seven “ - - - - .80 
Hight ‘“ - - - ol 
Dun en Bons - - .64 
Meany iy! - - - - 57 
‘Twenty “ - - - - .30 
Thirty ‘“ - - - - .20 
40- Forty ‘ - - - - .14 
Pittyy j.' - - - - .094 
50 
During the previous summer I made the following experiments 
upon a line of thirty-three miles, of number 17 copper wire, with 
a battery of fifty pairs. In this case, I used a small steelyard 
with weights, with which I was enabled to weigh with a good 
degree of accuracy the greater magnetic forces, but not the lesser, 
yet sufficiently approximating the recent results to confirm the 
law in question. 
