616 



LENZ ON ELECTRO-MAGNETISM. 



Hence may be calculated by means of the least squares 



= 1-73 and log. sin. 10 = 8-18478 

 therefore we have for the calculated values of a 



Here then the coincidence for this kind of experiments is very great, 

 go that we may regard the position as entirely confirmed, namely tliat 

 " the electromotive poiver which the magnet produces in a spiral, 

 with convolutions of equal magnitude and luith a tvire of equal thick- 

 ness and like substance, is directly/ in the same propoition as the num- 

 ber of the convolutions." 

 Moreover, we must not let it escape our attention, that in all the three 

 series of observations the differences of the calculated and of the ob- 

 served deviations are in the beginning positive, and then negative ; 

 which seems to show that the electromotive power increases in a some- 

 what quicker proportion than the number of the convolutions ; but the 

 differences are so small, and become, when the observations are made 

 with great care (as the third series proves) smaller and smaller, 

 I therefore ascribe this little irregularity to the influence of some pecu- 

 liar circumstance which up to the present moment I have not succeeded 

 in discovering. 



n. On the Influence of the Distance of the Convolutions of Spirals 

 on the production of tli£ Electromotive Power in them. 



In these experiments I employed at first the horseshoe magnet, but 



