OF ARTS AND SCIENCES. 



223 



I. The electromotive force of the alloys of tin and lead, and of 

 the metals themselves, when the resistance is 7,180 ohms, and the 

 constant of the galvanometer .000003435. 



The first column gives the deflection in millimeters; the second, 

 the tangent of one half the angle of deflection ; the third, the product 

 of the constant by the total resistance ; and the fourth, the electro- 

 motive force in volts. The liquid in this case is water. 



II. The electromotive force of the alloys of copper and zinc, with 

 a total resistance of 19,708 ohms, the constant being the same as be- 

 fore, and the liquid Fresh Pond water. 



The resistance of distilled water is so great, that it was impossible 

 to get any good or satisfactory results. The addition of about one 



