454 Mr. T. Tate on anew Electrometer for measuring 
When the machine was in a higher state of action, 20 revolu- 
tions, in 60 seconds, produced a discharge of 1:06 cubic inch; 
and upon repeating the experiment the discharge was found to 
be 1:04 cubic inch. 
Within certain limits, the quantity of liquid discharged is not 
sensibly affected by the diameter of the tube GE, or by the 
distance of the cup from the nozzle G: other things being the 
same, the diameter of the tube may vary from ,3,ths to ;4ths of 
an inch; and the distance of the cup from the nozzle may vary 
from 24 to 24 inches without sensibly affecting the amount of 
discharge. In like manner, slight variations in the diameter of 
the jar produced little or no sensible alteration in the amount of 
the liquid discharged. 
At the commencement of the operation, the columns of liquid 
being in equilibrium, the electrical action has simply to over- 
come the cohesion ofthe particles of the liquid for one another ; 
but as the process goes on, the water being more and more dis- 
charged, the equilibrium of the columns is destroyed, and the 
resistance to the discharge increases, so that, with the same elec- 
tric force, the rate of discharge of the water becomes less and 
less; but when the section of the jar is considerable, and the 
volume of the liquid displaced does not exceed a certain limit, 
the velocity with which the liquid is discharged is nearly uniform. 
The following experimental results show that, for equal quan- 
tities of water discharged (the machine being in a fixed state of 
action), the product of the number of revolutions by the correspond- 
ing time is (approximately) a constant quantity. 
Experiment I. 
Number of : Corresp. dis- | 
. Correspondin : 
hemmachine, |HHEIM seonds | Pe EStotaen, | Vaugot 
nN. : 
15 70 69 1050 
25 42 70 1050 
18 60 69 1080 
12 90 “69 1080 
The following experiment was made when the machine was in 
a different state of action. 
Experiment II. 
24: revolutions of the machine, performed in 80 seconds, pro- 
daced a discharge of 72 cubic izch of water; and 33 revolutions, 
in 60 seconds, produced the same amount of discharge. 
In this case 24 x 80=1920, and 38 x 60=1980. 
