486 M. R. Kohlrausch's Theory of the 



time, hovrever, we know that at the moment of transferring the 

 electricity, the single jar will show a tension on the knob equal 

 to that of the battery itself; hence, also, that the indication of 

 the electrometer will be the same at this moment whether it be 

 connected with the battery or with the single jar, for the quan- 

 tity of electi'icity which this instrument withdraws from the bat- 

 tery always vanishes in comparison to the quantity in the latter. 



To return to the experiment, therefore, the following method 

 was pursued. 



A second electrometer S' was placed near the battery, though 

 at so great a distance from the first S that their needles did not 

 irritate one another. Both were at first connected with the bat- 

 tery of five jars, and the latter charged. By the help of an 

 assistant both instruments were adjusted at the same moment. 

 The electrometer S showed thereby a deflection of 18° 49'. The 

 angle of deflection in the instrument S' was of no importance, it 

 being intended to remain undisturbed, so as, on subsequently 

 charging the battery, to indicate the riioment when the electro- 

 meter S, if the latter were stilJ connected with the former, would 

 show an angle of deviation equal to 18° 49', or in other words, 

 when the charge in the battery amounted to Q= A/sin 18° 49'. 



These preparations being made and everything discharged, 

 the instrument S was on another day connected wilh the single 

 jar, and by means of the galvanic current deflected to 13°. This 

 is the angle of deflection which would be produced if the charge 

 Q= \/sin 18° 49' in the battery spread itself over the single jar, 

 and corresponds to the valvie of x in the equation 



Q'= v^^b^rr 0-835 \/sinl8"49'. 



The battery was now charged again, the charge, which was at 

 first too great, weakened by contact with a rod of dry fir- wood 

 until the electrometer S' showed almost the requisite deflection, 

 and then the whole allowed to remain until, by loss of electricity, 

 exactly the former charge reappeared. At this moment, which 

 was communicated by an assistant, the falling lever substituted 

 the deflecting force of the electricity which was transferred to 

 the electrometer S for that of the galvanic current. The disturb- 

 ance of the needle was scarcely perceptible at first, but it soon 

 moved quickly towards the meridian, so that a new and correct 

 readjustment could only be made after 18 seconds*, when the 

 angle of deflection was 9° 50'. 



An assistant noted the time when the first charge was im- 

 parted to the jar, as well as the moments whenever the sine- 

 electrometer was readjusted, he also wrote down the correspond- 



* In this case the loss of so much time was due to bad manipulation. 

 In other observations the readjustment was often completed in 5 seconds. 



