620 



LENZ ON ELECTllO-MAGNETISM. 



X = 38-81 therefore L + / + A = 7V2'06, 



X' = 10-78 L + / + X' = 684-03, 



X"= 5-44 L + / + \"= 678-69, 



sin. (19° 3'), 

 sin. (19 48), 

 sin. (19 51 ), 



1-00305 and 



the equation (A.) gives therefore 



X =712-06 -p 

 x' = 684-03 - p 

 a;" =678-69-^' 



or, if the two last electromotive powers be compared with the first, the 

 proportions 



X _ 712-06 - sin. (19° 3') 

 x' ~ 684-03 - sin. (19° 48') 



JL = V12-06 - sin. (19° 3') _ j.QQg^ 

 x" 678-69- sin. (19° 51') 



Both propositions differ so little from unity that we are fully warranted 

 in concluding that the electromotive power which the magnet produces 

 in the wire No. 1 is quite as strong as those in the wires Nos, 3 and 4, 

 although the latter possesses a diagonal almost four and seven times 

 greater, and therefore that the electromotive power is independent of 

 the thickness of the wires. A second confirmation of this position is 

 found in the following experiment previously made : 



10 Conv. of wire No. 3 



No. 2 



No. 3 



Angle of Deviation. 



1 



36-3 

 36-0 

 35-4 

 33-6 



37-8 

 37-0 

 36-8 

 35-5 



33-5 

 32-1 

 32-6 

 35-7 



35-7 

 34-9 

 35-0 

 37-3 



Mean. 



35-82 

 34 

 35 

 35-52 



•0 -1 

 ■9 / 



34-95 



Consequently we have for 

 No. 2, a = 34-95, further 

 No. 3, a' =35-67, 



consequently 



X = 34-00, also L + ^ + X = 707-25 

 X' = 1 1 -52, and L + / + X' = 684-77, 



sin. (17° 29') ^ 



sin. (17° 50') ~ '- ^^^' 



^ _ 707-25 

 x' ~ 684-77 



Here also the proportion is so near to unity tliat we may from this, 

 combined with the above results, regard it as an established truth, that 

 " the electromotive power produced in the spirals hy the magnet re- 

 mains the same for every thickness of the wires,or is independent of it." 

 From this law again it immediately follows that in rings of wires of 

 various thickness surrounding the armature of the magnet, the electric 



