Defcription of an intproiJed Ele^romeier. S75 



from the ball E would rather attraft D, and, by its contact 

 with G, promote the difcharging; by which the inftrumenC 

 would fail of its objeft, and be fubjefted to the temperature 

 of the almofphere like all other eleArometers ; and befides 

 this, the ele6tric power could no longer be determined by 

 weight. To obviate this inconvehience, the inftrument, in 

 all ele6lrical experiments, muft be applied in fuch a manner 

 that the power with which the ball D is attrafted by AB 

 may exceed in ftrength the power required to repel the ball 

 B from the ball E. For this purpofe the ring S muft always 

 be removed two divifions farther on CD, towards D, than 

 the ring Q is fhifted on AB towards B. If, for example, an 

 electric force were required equal to eight grains, according 

 to this eleftrometer, the ring Q muft be removed to the place 

 where 8 ftands, and the ring S to the place marked 10. The 

 repulfive power will then naturally repel the balls B and E 

 before G is in a condition to attraft the ball D, as a power of 

 two grains would be neceflary for this purpofe, befides that 

 of the eight already in aftion. The ftiell H, with its weight 

 of fourteen grains, will eafily overcome the preponderance of 

 LD over LC, as it amounts only to ten grains, and there- 

 fore nothing exifts that can impede the difcharging. 



When the ring S, according to the required power, is 

 removed fo far toward.^ D that the fliell H is not able by 

 its weight to dcftroy the preponderance of LD in regard to 

 LC, the active power of the lliell 11 muft be fo far in- 

 creafcd by the addition of weights that it can ail, with 

 a preponderance of four grains, on the plate C If, for 

 example, an cleftric power of fourteen grains be required, 

 the ring S muft be removed to 16, by which LD refts 

 upon fl, with a preponderance of fixtcen grains in regard 

 to LC. Now to make H ad on the plate C with a 

 preponderance of four grains, it muft be increaft-d to twenty 

 grains, that is, fix grains weight more muft be added, as 

 it weighs only fourteen; which fix grains are again laid 

 upon LB ; and therefore the ring Q is fliifted to ao, as the 



Voj.. IV. T ftrengtU 



