Quadrant-Electrometer. 295 
by the aid of the inductor, using the 18 Daniells as a standard 
potential. As the charges range as high as 2600 Daniell’s 
elements, the higher numbers can only be regarded as very 
rough approximations; sufficiently near, however, to indicate 
the sort of result which would be obtained if more precise 
methods were used. The first column in the following Table 
gives the ascertained or estimated charge of the jar of my 
electrometer in Daniell’s elements; the second the deflection 
in scale divisions caused by three elements ; the third, the 
coefficient A, deduced by the formula 92=AAC: this coefficient 
ought theoretically to be constant. 
I II. IIT 
72 (i) 0°35 
112 118 0:35 
136 140 0-35 
178 190 0°35 
238 239 0°34 
303 288 0°32 
383 336 0:30 
512 391 0:26 
616 409 0°22 
813 432 0-18 
1080 424 0:13 
1312 402 0-10 
1728 360 0-07 
2124 320 0:05 
2634 296 0-037 
1704. 353 0:07 
1436 304 0:09 
1284 412 O-11 
876 436 0-17 
684 427 0-21 
By connecting the jar and one quadrant to 18 elements and 
the other quadrant to earth, I obtained 0°356 as the value of 
d, making use of the complete equation 
@=.(A—B)(o—4+*). 
It will be seen that this equation may be trusted until C is 
over 200 Daniell’s elements potential, but that when C exceeds 
250 a quite different law rules. 
The foregoing was read before the Physical Society a few 
years ago, but I stopped its publication after the type was set 
up, because I was not satisfied that my appliances for experi- 
ment were satisfactory, or that I could give any satisfactory 
explanation of the anomaly. 
_ The electrometer had been many times adjusted for various 
purposes before further experiments were made, so that those 
