234 Me Wi on Electric Coniaien, in Metals. 
the circuit. The e wire ab was, of anit, always soldered at 
a and b, and for the trial cd and the two ef, e’f’, were poldenas 
evenly as possible, an is battery current passed from P to 
Not trusting to the exact equality of electric tension between ive 
points a and c, 6, f and f’, eand e’, at the ends of the copper 
plates, points of equal tension near them were carefully ascer- 
tained by actual experiment, which points we designate still by 
the same letters. Also points of equal tension p and d, anda 
point g, of equal tension withe and e’, The result for the length 
of the several parts was, 
(1.) ap=29-93 inches, 9b=29-98 in. ef=37-98 in. 
od= 19-02... “ e’ f' = 37-98: 
Here 2cd : ef, ($ 5.)22634 3 633. 
Adding the wire ef” to the previous ones, and taking all the 
points of equal tension anew, the result was, 
(2.) ap=23-48 in. qb =23-48 in. ef’ =38°05 in. 
ini 12-71 * Bt bee =—38:06 “ 
> ef ::508 : 507. 
to next e’”f”, and proceeding in like manner, 
(3.) ap=47-43 in. gb=19:35 in. ef’ =38-10 in. 
cd =23'41 “ ef =38-13, 
e” 74 — 38: sD 
Acd . qb : 38°12. ap, ($ 5.)::465 : 464. 
Comparing in the same way three wires cd, ed’, ed’, with the 
four ef, 
(4.) ap=29°69 in. e’d’ = 23-19 in. 
Cd = 23-21 Se 
= . 7 e! — 
qo=36'68 in. Jd mee. hs in. mean, 98-14, 
gb .23-20 : Sap. 38: 14::500 : 499. * 
8. These results show the approximate truth of our first prop- 
osition ; but the deviations are observed to be all on one side, and 
camaikably uniform in magnitude. To ascertain whether this 
was not owing to a small inequality of conducting power, the eX- 
periments were varied by reversing the wire ab, marked now J’a’. 
Comparing ed with ¢f and ef, and finding points of equal ten- 
sion as before, the result was, 
(5) b'p=3595 in. | qa’=30-07 in, ef = 38-06 in. 
ed=22-91 « ef’ =38-06, “ 
2cd. qa’ ; ef. b’p::144 ; 143. 
mon, 23:20. 
