154 REPOET 1891. 



These comparisons were made with Flat, and lead to the conclusion 

 that it has remained unchanged. 



In November, 1890, the Association was invited by the President ot 

 the Board of Trade to nominate two members to reiDresent the Associa- 

 tion on a Committee ' On Standards for the Measurement of Electricity 

 for use in Trade.' A meeting of the Electrical Standards Committee was 

 held on December 2, and it was agreed to suggest to the Council of the 

 Association tlie names of Professor Carey Foster and j\lr. R. T. Glaze- 

 brook as representatives. These gentlemen were ajDpointed by the Board 

 of Trade together with Mr. Courteuay Boyle, C.B., Major Carden, Mr. E. 

 Graves, Mr. W. H. Preece, Sir Wm. Thomson, Lord Rayleigh, Dr. Jno. 

 Hopkinson, and Professor Ayrton. 



This Committee after various meetings drew up a report, a copy of 

 which is printed as Appendix I. to this report. 



The standards of resistance constructed in accordance with Resolution 

 6 of the report are now in the hands of the Secretary, and are being 

 compared with the standards of the Association. 



Numerous experiments on the methods of constructing Clark's cells, 

 and on the electromotive force of such cells, have been made at the 

 Cavendish Laboratory by Mr. Wilberforce, Mr. Skinner, and the Secre- 

 tarj'. These are still incomplete, but the experiments so far as they have 

 been finished lead to the value 1-434 volts at 15^ for the E.M.F. of the cell. 

 The value found by Lord Rayleigh was 1'435 at the same temperature. 



Mr. I'itzpatrick has continued his experiments on the resistance of 

 silver, and an account of these will be given in a future Report. 



The Committee ask for reappointment with omission of the names of 

 Principal Garnett and Mr. H. Tomlinson, and addition of those of Dr. G. 

 Johnstone Stoney and Professor S. P. Thompson. They recommend that 

 Professor Carey Foster be Chairman, and Mr, R. T. Glazebrook Secre- 

 tary. They further ask to be allowed to retain an unexpended balance of last 

 year's grant, amounting to 171. 4s. 6d., as well as for a new grant of 10/. 



APPENDIX I. 



Repokt of the Electrical Standards Committee appC'Ixted by the 

 Board op Trade. 



To the Eiglit Honourable Sir Michael Hicks-Beach, Bart., 3LP., President 

 of the Board of Trade. 



In compliance with the instructions contained in your Minute of the 

 16th December last, that we should consider and report whether any, and, 

 if so, what action should be taken by the Board of Trade under section 6 

 of the Weights and Measures Act, 1889, with a view to causing new 

 denominations of standards for the measurement of electricity for use for 

 trade to be made and duly verified, we have the honour to submit the 

 following report : 



1. Before coming to a decision as to the points referred to us, we 

 were anxious to obtain evidence as to the wishes and views of those 

 practically interested in the question, as well as of Local Authorities 

 who are concerned in the administration of the Weights and Measures 

 Acts. 



