622 LENZ ON ELECTRO-MAGNETISM. 
Angle of deviation. 
Mean. 
Copper spir. on the ar- 
Copper and | mature 
iron spirals Iron spirals 
Bere spirals 
| Coprer spir. on the ar- } 
Copper and raenia a 
platina spirals 
Platina spirals 
Copper spirals 
Brass spir. on the ar- 
Mature -..cecs6 Saanees 
Copper and 
brass spirals. |) Copper spirals 
Brass spirals ... ..... eevee 
If we now combine the single means together and convert the deci- 
mals of the degrees into minutes, we obtain from this table the follow- 
ing results: 
Copper spirals, deviation .... «= 17° 36'-0 
Iron spirals, eed: Ae ide Cleve 
Copper spirals, deviation....a@ = 15° 345 
Platina spirals, ovee 15. Bae 
Copper spirals, deviation....a@ = 18° 19'-2 
Brass spirals, oso @ =18) 2008 
Since in this case the resistances remain the same for every pair of 
observations, our chief equation (A.) gives, when treated as before, the 
following proportions of the electromotive powers, if we designate them 
for copper, iron, platina, and brass with a, a’, x!’, a!!': 
w _ sin. (8° 43"0) _ 
pats : = 1:0 
a’! sin. (8° 42"6) a: 
#00 sins (7947/2). 
aN = 5 2, 
x" sin. (7° 47'"6) ie 
sca sin. (9° 9"6) _ = 0-99894. 
a!" ~~ sin, (9° 10' 2) 
These three proportions are all of them so near to unity that there will 
exist no doubt as to the fact, that wires of copper, iron, platina, and 
brass suffer one and the same electromotive action; and that I may be 
allowed to extend the same position by analogy, even to all other me- 
tals and substances in general, until direct experiments shall have left 
the matter beyond all doubt. We shall have therefore the law, 
“that the electromotive power which the magnet produces in spirals 
