392 Experiments with Grove’s Battery. 
Table of Results. 
Fifty pairs through 2 miles attracted and raised 9 ozs. 
(73 66 4 ce 66 (74 4 ce 
66 6¢ 6 &6 6c 6¢ 3 43 
19 66 8 73 66 66 24 (14 
te ce 10 6¢ 44 66 24 66 
14 its 12 6c 74 6c 4 ce 
14 (14 14 66 6 6 4 ce 
and each successive addition of two miles up to thirty-three, still 
gave an attractive and lifting power of one-eighth of an ounce. 
Curve from the Results. 
2 1 oz. 2 3 4 5 6 7 8 9 
= 1 , 
A great irregularity is seen between 
16 +— 
the 10th and 12th mile, which is due 
te undoubtedly to a deficiency of accura- 
20 cy in the weighing apparatus. 
99 _|- I take pleasure in sending you the 
following calculation of the law of the 
24 : : : 
i conducting power of wires, for which 
2 I am indebted to my friend Prof. Dra- 
28 per, of the New York City University. 
30 
32 
33-+- 
On the law of the conducting power of wires; by Joun W. Dra- 
PER, M. D., &c. &c. 
It has often been objected, that if the conducting power of 
wires for electricity was inversely as their length, and directly as 
as their section, the transmission of telegraphic signals through 
