ELECTRICAL STANDARDS. 
151 
At the Ipswich Meeting of the Association the question of a standard 
thermal unit was referred to the Electrical Standards Committee, and has 
been under their consideration during the year. 
After the Ipswich Meeting Mr. E. H. Griffiths sent the following letter 
to a number of physicists in various foreign countries, together with a copy 
of the paper! he had communicated to the Association :— 
Herewith I forward you a copy of a recent communication to the ‘ Philo- 
sophical Magazine, in which I have endeavoured to call attention to the 
unsatisfactory nature of our present system of thermal measurements. 
At the Ipswich Meeting of the British Association the consideration of the 
question of a standard thermal unit was referred to the Electrical Standards 
Committee. 
As a member of that Committee I now approach you with a request that 
you will communicate to me any suggestions which you may regard as calculated 
to assist our deliberations on the subject. 
I am anxious to lay before the Committee the opinions of the leading 
authorities of al! countries; I trust, therefore, that you will favour me with 
some expression of your views, particularly as to the nature and magnitude 
of the thermal unit (if any) that you would recommend for adoption. 
Unless you state that I am to regard your reply as ‘ for Committee only’ 
or ‘ private,’ I shall conclude that you have no objection to its publication. 
The importance of arriving (if possible) at some general agreement regard- 
ing the thermal unit will, I hope, be accepted as a sufficient excuse for thus 
troubling you. 
Copies of the circular letter, and of the paper ' on the Thermal Unit, 
were sent to the following :— 
Professor Abbe, Washington, U.S.A. 
Professor Ames, Baltimore. 
Professor Bartoli, Pavia. 
Professor Barus, Providence, B.I. 
Professor Benoit, Sevres. 
Professor Berthelot, Paris. 
Professor Boltzmann, Vienna. 
Professor Callendar, Montreal. | 
Dr. Chappuis, Bureau International, | 
Sévres. | 
Dr. Curie, Paris. 
Professor Dieterici, Hanover. 
Professor Dorn, Halle. 
Professor Du Bois, U.S.A. 
Professor Willard Gibbs, Yale, U.S.A. 
Dr. Guillaume, Bureau International, 
Sevres. 
Professor Hall, Harvard, U.S.A. 
Professor Himstedt, Freiburg. 
Professor Hittorf, Miinster. | 
| 
Professor Joubert, Paris. 
Professor Kayser, Bonn. 
Professor Kohlrausch, Berlin. 
Professor de Kowalski, Freiburg, Swit- 
zerland. 
Dr. S. P. Langley, Washington, U.S.A. | 
Professor Landolt, Berlin. 
| 
Professor Le Chatelier, School of Mines, 
Paris. 
Professor Lippmann, Paris. 
Professor Victor Meyer, Heidelberg. 
Professor Nernst, Géttingen. 
Professor Nichols, Ithaca, U S.A. 
Professor Olszewski, Cracow. 
Professor Ostwald, Leipzig. 
Professor Overbeck, Tiibingen. 
Professor Paschen, Hanover. 
Professor Planck, Berlin. 
Professor Pellat, Paris. 
Professor Pernet, Ziirich. 
Professor Potier, Hcole Polytechnique, 
Paris. 
Professor Quincke, Heidelberg 
Professor Remsen, Baltimore, U.S.A. 
Professor Rowland, Baltimore, U.S.A. 
Professor Runge, Hanover. 
Professor Schuller, budapest. 
Professor Stohmann, Leipzig. 
Professor J. Thomsen, Copenhagen. 
Professor Van ’t Hoff, Amsterdam. 
Professor Vaschy, Ecole Polytechnique, 
Paris. 
Professor E. Warburg, Berlin. 
Professor Wartha, Budapest. 
Professor Weber, Ziirich. 
Professor E. Wiedemann, Erlangen. 
Professor G. Wiedemann, Leipzig. 
Professor Wiillner, Aachen. 
1 Phil. Mag., November 1895. 
