C1184 
The columns 2, 3 and 4 of Table IV give the mean values, 
obtained from experiments with the mercury as positive pole and 
the sulphuric acid as negative pole and reciprocally. Usually the 
deflections, calculated for 1 millivoit at first slightly increased with 
increasing P. D. then reached a maximum and further decreased. 
On account of the above mentioned relatively too short oscillation 
time of the galvanometer, the maximum value of ej probably will 
be the most accurate for calculating the work done, we therefore 
will make use only of the maximum. 
The values in column 2 of Table V are obtained only with 
mercury as the positive pole, sulphuric acid as negative pole. They 
represent the means of observations with suddenly applied and 
suddenly annulled P. D. 
For three capillary electrometers I have calculated the work 
necessary for the motion up and down of the meniscus, the difference 
of potential being “= 1 millivolt. 
The calculation always was made in two different manners, in 
the first place from mechanical principles using the difference of 
pressure, necessary for the displacement and the dimensions of the 
capillary; in the second place from electrical principles using the 
deflections of the galvanometer, see Table VI. 
EAS Ar Be 
| Work done as calculated from dimen- | Work done calcu- 
Number | sions of the capillary-electrometer and | lated from galvano- 
of the the raanometer readings. ‚__meter readings 
capillary. | | in 
| in gram-centim. in Joules. | Joules. 
| | 
Sia toy San —13 
B. 101 1,282 x 10 1,258 x 10 1,405 X 10 
en Wl 2,209 AU 2 2,162 nv | 2,157 ” i 
B. 108 | 8,05 TT ae 139 “ow 6,16 nv 
The agreement between the values of columns 3 and 4 of the 
given Table VI, though not very beautiful may yet be called 
satisfactory considering the different measurements necessary in 
calculating the result. 
Concluding, we will see what part of the work done is spent 
