30 REPORT— 1904. 
of the National Physical Laboratory in October last, and found to be 
working well. The results for the year 1903 have been printed in the 
Proceedings of the Cornwall Polytechnic Society and in the Report of the 
National Physical Laboratory for 1903. Dr. Chree is at present engaged 
in examining the Vertical Force Records for 1904, with a view to deter- 
mining how best to treat these. They have not hitherto been worked out 
in full. 
The records for the great magnetic storm of October 31 and Novem 
ber 1, 1903, were specially good, and have been reproduced in the 
Laboratory Report. 
In view of the fact that the Kew magnets are very much disturbed 
and that the buildings at Eskdale Muir have only just been commenced, it 
is in the opinion of the Committee desirable that their work should be 
continued. They therefore recommend their reappointment, with a grant 
of 50/. 
Experiments for improving the Construction of Practical Standards for 
Electrical Measurements—Report of the Committee, consisting 
of Lord RayLEIcH (Chairman), Dr. R.'T. GLAZEBROOK (Secretary), 
Lord Ketvin, Professors W. E. Ayrron, J. Perry, W. G. 
Apams, and G. Carry Foster, Sir OLtver J. Lope, Dr. A. 
MurrueapD, Sir W. H. Preece, Professors J. D. Everett, A. 
Scuuster, J. A. FLemine, and J. J. THomson, Dr. W. N. SHaw, 
Dr. J. T. BorroMtey, Rev. 'I’. C. Firzparricx, Dr. G. JOHNSTONE 
StonEy, Professor 8. P. THompson, Mr. J. Renniz, Principal 
E. H. Grirrirus, Sir A. W. Ricker, Professor H. L. CALLENDAR, 
and Mr. GEORGE MaTTHEY. 
APPENDIX PAGE 
I.-—On Anomalies of Standard Cells. By¥.¥E. Smirw. (From the National 
Physical Laboratory) . : ; : : : ; ‘ : , 33 
Il.— On the Electromotive Force of a Clark Cell. By A. P. TROTTER . : . 40 
Tue Committee desire to record their deep regret at the death of their 
colleague, Professor Everett, who had been a member of the Committee 
since 1881. He attended the meeting at which the present Report was 
considered. His work in connection with the C.G.S. system of units is 
of great importance and has proved of very real value to science. 
The Committee are glad to report that during the year considerable 
progress has been made with the construction of the Ampére Balance. 
Mr. L. Oertling has constructed the weighing mechanism, which has, 
however, not yet been taken over by his Committee, and the electrical 
parts of the instrument are nearing completion in the workshops of the 
National Physical Laboratory. The following particulars of progress 
and of applied tests may be of interest. 
1. The weighing mechanism.—tThe castings, rods, tubes, screws, &c., 
.ntended for this had their magnetic permeability determined, and no 
part used in the construction has a permeability differing from unity by 
more than 0°001 per cent. 
The balance was examined for stability and sensitiveness at Messrs, 
