248 Life of Count Rumford. 



Date of Award. 



1842. Henry Fox Talbot. Discoveries and Improvements 

 in Photography. 



1846. Michael Faraday. Discovery of the Optical Phe- 

 nomena developed by the Action of Magnets and 

 Electric Currents in certain Transparent Media. 

 (Phil. Trans. 1846.) 



1848. M. Regnault. Experiments on Expansion and Den- 

 sity of Air, different Gases, and Mercury. 



1850. F. J. D. Arago. Experimental Investigation on 

 Polarized Light. 



1852. Geo. G. Stokes. On the Change of Refrangibility 

 of Light. 



1854. Dr. Neil Arnott. A new Smoke-Consuming and 

 Fuel-Saving Fireplace. 



1856. M. Pasteur. Discovery of the Nature of Racemic 

 Acid, and its Relations to Polarized Light. 



1858. M. Jamin. Various Experimental Researches on 

 Light. 



1860. Prof. James Clark Maxwell. Researches on the 

 Composition of Colors, and other Optical Papers. 



1862. Prof. Kirchhoff. Researches on the Fixed Lines of 

 the Solar Spectrum, &c. 



1864. Prof. John Tyndall. Researches on the Absorption 

 and Radiation of Heat by Gases and Vapors. 



1866. M. Armand Hippolyte Louis Fizeau. Optical Re- 

 searches and Investigations into the Effect of Heat 

 on the Refractive Power of Transparent Bodies. 



1868. Mr. Balfour Stewart. Researches on the Qualitative 

 as well as Quantitative Relations between the 

 Powers of Emission and Absorption of Bodies for 

 Heat and Light. 



Count Rumford was probably well aware of the conten- 

 tion and ill-feeling that had arisen in the Royal Society, 

 some years before, because those who administered the 

 trust for the Copley Medal considered foreigners equally 



