ON STANDARDS FOR USE IN ELECTRICAL MEASUREMENTS. 



31 



Appendix I. 



On the values of the B.A. standards of resistance greater than 1 B.A. unit. 



The coils of approximate value 10 B.A. units marked Elliott Bros., 

 No. 66 and No. 67, or ffi? 20 and 21 respectively, were compared with the 

 B.A. standards by the method described in the last report, 1 with the results 

 given in the following table : 



The coils were immersed in the water bath, the temperature of which 

 remained constant during each observation, for some days before the 

 measurements were made. 



The values thus found were used for the determination of the coils of 

 higher resistance, the methods of the last report - being employed in this 

 case also. The insulation of the various parts of the apparatus was tested 

 carefully. Each result given in the table is the mean of two or more 

 determinations at the same temperature. The readings of the thermo- 

 meter used were compared with those of a standard instrument. 



1 B. A. Eeport 1883, p. 43. 



2 B. A. Eeport 1883, p. 44. 



