ON STANDARDS FOR USE IN ELECTRICAL MEASUREMENTS. 109 
Hence in this series : 
n=79'°849, c=5888'4, 
The accuracy attained in this series is a fair specimen of the whole. 
With these explanations we proceed to give the results in tabular form, 
_ showing the date, the values of n and c, and the resulting value of c. The 
wire by which the condenser was connected to the commutator, together 
with the commutator itself, had a certain capacity which was determined 
in the same way, merely disconnecting the wire from the condenser. In 
_ the observations in December and June we found— 
a=10 d=98730 c=28460 n=63'9, 
_ whence the capacity of the wires is -0000625 microfarad, while in August, 
after the apparatus had been set up afresh in a different position with new 
connecting wires, the value of ¢ was 22,200 and the capacity -0000799 
microfarad ; for the wires the values of ¢c could be determined to about 
1 per cent. 
In the table the value of c has been corrected for the capacity of the 
wires. 
Taste I.—Oondenser I. 
Date Value of c Value ofn | a esnot 
14762°5 31:95 “021025 
December 31, 1889 . | 73723 63°90 “21016 | 021020 
5894°3 79°875 *021019 
14772°9 31:93 *021023 
May 20,1890 . 73765 63°86 ‘o21017 | 021022 
5896°4 79°825 *021025 
June 16,1890. : : 73750 63°86 *021022 "021022 
147459 31:939 *021038 
August 27, 1890 | 7364:'8 63°879 ‘021027 | 021032 
5888'4 79°849 ‘021030 
Mean of the whole, ‘021024 microfarad. 
Taste IJ].—Condenser II. * 
c, in micro- Mean of 
Value of ¢ Value of x eitane Savicg 
( 13957°4 31:95 022238 
December 31, 1889 . 6963°6 63°90 022249) "022237 
(| 557541 79°875 022225 
1394593 31:93 “022271 
May 20, 1890 . : 6957°4 63°86 “022283 } 022273 
} 5568°2 79°825 *022266 
| June 16, 1890 . A . 6953°4 63:86 *022296 "022296 
F 137746 31939 022523 
_ | August 27, 1890 5 6878°6 63°879 022515} 022519 
; 5500°4 79849 *022518 
August 28, 1890 : c 6878°6 63°881 *022515 "022515 
