436 MR. J. E. H. GORDON ON MEASUREMENTS OE ELECTRICAL CONSTANTS. 
on the plate. When the balance was loaded with 18 ounces, it turned with about 
2 grains. Weight of lead sinker in water, 1 lb. 4 oz. 4 dr. 1 scr. 2 gr. 
Weights of plates in water equal weights of plates with sinker, minus weight 
of sinker in water. 
Temperature of water 11° C. 
Plate. 
Weight in air 
in grains. 
Weight in water 
in grains. 
Specific gravity 
at 11° C. 
No. 1 
9600 
-1330 
•8783 
9, 
9282 
— 1330 
•8771 
„ 3 
9904 
— 1160 
•8951 
„ 4 
10,797 
-1322 
•8909 
„ 5 
10,027 
-1201 
•8933 
„ 6 
10,585 
— 1149 
•9021 
Let us write 
We shall then have 
0 = 
Sp. gr. of plate Sp. gr. of plate 
Sp. gr. of paraffin '9109 
b' = b(f). 
Let us call K' the corrected value of K, that is, the value of K calculated from b' 
instead of from b, and we shall have from the experiments, and the above determina¬ 
tions the following:—- 
Summary of experiments on paraffin. 
Plate. 
0. 
b. 
V. 
K. 
K\ 
No. 1 
•9642 
•730 
•7038 
1-9261 
1-9940 
2 
•9628 
•750 
•7221 
1-9084 
1-9784 
„ 3 
•9826 
•748 
•7249 
1-9358 
1-9969 
„ 4 
•9780 
•782 
•7648 
1-9697 
2-0126 
„ 5 
•9868 
•755 
•7450 
1-9408 
1-9654 
„ 6 
•9903 
•754 
•7467 
1-9947 
2-0143 
Mean value of 
K= 1-9459 
K'= 1-9936* 
Among the corrected values the extreme difference from mean is — 1 '4 per cent. 
* N.B.—In future this number will be called K, 
