WITH THE CAVENDISH APPARATUS. 
225 
29th Series. — 2-ineh zinc balls with bifilar silk lines *367 inch distant, December 
24th, 1841. By pursuing- the same mode of calculation, log C = 6'358224, I find as 
follows : — 
Pos. Expts. i-. 
Neg. Expts. 
l 
s r 
1357 
•68293 
1358 
•31984 
1359 
•58530 
1360 — 
•18163 
1361 
•55658 
1362 - 
•25055 
1363 
•65864 
1364 — 
•34102 
4)2-48345 
4)- 
1-09304 
•62086 
— •27326 
2)-34760 
•17380=^, 
.-. A = 5-7537. 
•27326 
On referring to the investigation, it will be seen that neglecting the small quantity 
rn 2 b*, by equations (2.) and (5.) is a measure of the magnetic action during two 
consecutive positive and negative experiments. Accordingly we have the following 
table : — 
Experiments. 
1357 
1358 
1359 ' 
1360 ’ 
1361 ' 
1362 
1363 ’ 
1364 ’ 
Quantities proportional to magnetic action. 
1-002 77 
-90514 
-76693 
*73821 
-80713 
-90919 
-99966 
The apparatus is here assumed to have been in a normal state, or very nearly so. 
52nd Series. — 2^-inch lead balls with single copper wire, dist. -0178 inch, March 
20, 1842. 
Pos. Expts. — 
0 
1893 -27914 
1895 *24245 
Neg. Expts. -■ 
1894 -09847 
1896 -12632 
2)-52159 
•26079 
•11239 
2)*22479 
•11239 
2)-37318 
•18659= .-. A = 5-3593. 
* m^b must be very insignificant ; for no experimenter would suffer his apparatus to be so much out of order 
as to render it very sensible. 
2 G 
IWDCCCXLVir. 
