REPORTS 
ON THE 
prATE OF SCIENCE. 
Report of the Committee, consisting of Professor G. CAREY Foster, 
Sir W. THomson, Professor AyRTON, Professor J. PERRY, Pro- 
fessor W. G. ApAms, Lord Ray.LercuH, Dr. O. J. LopGr, Dr. Jonn 
‘Hopkinson, Dr. A. Murrgeap, Mr. W. H. Preece, Mr. H. Taytor, 
Professor EVERETT, Professor ScuusTER, Dr. J. A. FLEMING, Pro- 
fessor G. F. FirzGEraup, Mr. R. T. GLAzEBROOK (Secretary), Pro- 
fessor CHrysTaL, Mr. H. Tomuinson, and Professor W. GARNETT, 
appointed for the purpose of constructing and issuing practical 
Standards for use in Electrical Measurements. 
uy 
Tue Committee report that during the year the standards of resistance, 
4 in terms of the legal ohm refer red to in the last Report, have been con- 
structed, and their values determined in accordance with the resolution 
adopted on June 25, 1884. 
i The one-ohm standards were generally referred to the original B.A. 
units of the Association by combining in multiple are with the standard 
one of the 100 B.A. units, and determining by Carey Foster’s method the 
difference between the combination and a B.A. unit, and then assuming, 
in accordance with the resolution, that 1 B.A. unit = ‘9889 lecal ohm. 
The following values were thus found for the two standards. 
The temperatures were taken by a thermometer graduated to tenths 
of a degree centigrade, which had been compared with the Kew standards. 
Resistance Coil, Elliott, No. 139, , 100. 
Date Temperature | Resistance 
WNov.24,1s84 . . 114 -99878 
os. . |. 11°-6 ‘99890 
2 = : 5 12°:9 “99916 
MG 13°5 ‘99930 
i 13°5 “99931 
12, a 5 F 15°3 “99979 
July 30, 1885 e : : 17°°2 1°00027 
Be aOay! 55 3 : ; 18° 1 1:00061 
Mean value . 5 3 999515, at 14°°1 C. 
Temperature coefficient : 3 000271 
