ON RADIATION IN A MAGNETIC FIELD. 63 



University of Ireland owing to the illness and death of the Secretary of 

 the Committee, Professor T. Preston, F.R.S. They desire to be re- 

 appointed without a grant for the purpose of publishing copies of Professor 

 Preston's photographs, as they believe that a good deal of useful work 

 could be done upon these photographs by persons who are not possessed of 

 the spectroscopic and magnetic power required to produce the phenomenon 

 on a large scale. Others may desire to obtain copies of the photographs 

 as illustrations of this interesting effect of magnetisation on light. 



Exjjeriments for improving the Construction of Practical Stdndards for 

 use in Electrical Measurements. — Report of the Committee, consistimj 

 p/Lord Rayleigh {Chairman), Mx. R. T. Glazebrook (Secretary), 

 Lord Kelvin, Professors W. E. Ayrton, J. Perry, W. G. Adams, 

 Oliver J. Lodge, and G. Carey Foster, Dr. A. Muirhead, Sir 

 W. H. Preece, Professors J. D. Everett and A. Schuster, 

 Dr. J. A. Fleming, Professors G. F. FitzGerald and J. J. 

 Thomson, Mr. W. N. Shaw, Dr. J. T. Bottomley, Rev. T. C. 

 Fitzpatrick, Professor J. Viriamu Jones, Dr. G. Johnstone 

 Stoney, Professor S. P. Thompson, Mr. J. Rennie, Mr. E. H. 

 Griffiths, Professor A. W. Rucker, Professor H. L. Callendar, 

 Mr. George Matthey, and Sir W. Roberts-Austen. 



Appendix. —]Vote 0)1 an In)2}rofedIteswtance Coll. ^y Robert S. Whippll; 2'- 55 



DuEiNG the year the resistance coils and other apparatus belonging to 

 the Committee have been removed to Richmond. Most of the apparatus 

 has been set up in an outbuilding attached to the Kew Observatory, which 

 has been fitted by the Committee of the National Physical Laboratory as 

 a temporary laboratory. 



It is interesting to note that tlie case containing the original coils of 

 the Association bears the words, ' To be deposited at Kew.' After many 

 wanderings the coils have at last returned to their home. 



The Sub-Committee on Platinvim Thermometry held a meeting in the 

 spring, and agreed to the following resolutions : — 



(i) That a particular sample of platinum wire be selected, and platinum 

 thermometers be constructed therefrom to serve as standards for the 

 measurement of high temperature. 



(ii) That Mr. Glazebrook and Professor Callendar be requested to 

 consider the details of the selection of wires and construction of ther- 

 mometers for the abuve purpose, and to consult with Mr. Matthey, who 

 kindly consented to give his assistance. 



Since tiien Mr. Matthey has supplied the Sub-Committee with two 

 specimens of very pure platinum. Portions of these have been made into 

 tliermometers and tested at the National Physical Laboratory, with the 

 following results, R^ being the resistance at 0^ and R,oo at 100°, while 

 8 is the coefficient occurring in Callendar's difference formula : 



R,„(,/R„ 5 



Wire 1 . . 1-388.3 . . 1-493 



„ 2 . . 1-3884 . . 1-498 



