336 



TENTH ANNUAL REPORT OF 



DELEUIL ELEMENT. 



STOHEER ELEMENT. 



DANIELL ELEMENT. 



_ For height of the cylinder, the height of the part immer.sed in the 

 liquid is here given. In the Stohrer carhon-cyliuder, the bottom is 

 closed except a hole in the middle, hence the inner surface of the vase 

 must be reckoned as the surface of the carbon. 



To compare the surfaces of the different elements more conveniently, 

 the mean is determined from the positive and negative cylinder ; we 

 will term it the mean surface of the element. Reduced to one square 

 decimetre of mean surface, we get the following resistances : 



a. Deleuil's element 21. 



b. Stuhrer's ^' 12. 



c. Stohrers' '' 43, 



d. Daniells' " 78. 



e. Wollaston's " 13.6. 



With equal surfaces, the resistances of the elements were in the ratio 

 of these numbers. 



