412 Proceedings of the Society of Arts. 



List of Frizes for Session 1840-41. 



The Society for the Encouragement of the Useful Arts in 

 Scotland, announces the following Prizes for Session 1840-41. 



I. For the most important Invention, Discovery, or Improve- 

 ment in the Useful Arts ; — The Keith Medal, value Thirty Sove- 

 reigns, 



II. The Society proposes also to expend the sum of One Hun- 

 dred and Twenty Sovereigns, in various Pecuniary Prizes, and 

 Honorary Medals, in rewarding approved Communications on the 

 following subjects, — or any other Inventions or Improvements, — 

 or Essays or detailed Accounts of Public or other Undertakings 

 of great National importance (not previously published), which 

 may be submitted to them. 



1. For the best series of Experiments applicable to the Useful 



A rts. 



2. For the most important Communication of any useful Inven- 



tion, Process, or Practice, from foreign countries, not yet 

 known or adopted in Great Britain. 



3. For Improvements on Instruments for measuring minute 



quantities of Heat, on the principle of the Thermo-Multi- 

 plier, or otherwise. The essentials especially to be kept 

 in view are. Sensibility, Comparability, and Promptness 

 of Action. 



4. For a method of procuring Small Intense and Constant 



sources of Heat, for Philosophical purposes, — whether from 

 obscure or luminous sources. 



5. For Improvements in the Hardening of Iron, and Tem- 



pering of Steel. 

 G. For the best series of Experiments on Photography, parti- 

 cularly as to the Preserving and Multiplying of the im- 

 pressions. Specimens to be deposited. 



7. For the best method of obtaining a supply of Artificial Light 



under Water, suitable for the purposes of Divers engaged 

 in submarine operations at considerable depths below the 

 surface. 



8. For Specimens of Lithography or Zincography, bona fide 



drawn and printed by Artists resident in Scotland. Three 

 copies of each specimen to be lodged 'ow or before 1st March 

 1S41. Prizes will be given to the best and second best in 

 compel ition, if approved. 



