PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 349 



For the best novelty in the construction of railroads Silver Medal. 



For the best novelty in warming and ventilating buildings, 

 having especial regard to health, safety and economy Silver Medal. 



For the best essay on the measure of power Silver Medal. 



For the best original researches or monographs on any subject 

 pertaining to the science of chemistry, or mechanics, or 

 their practical applications Gold Medal. 



For the best samples of American manufactured flax fabrics, 

 with the cost of manufacture Silver Medal. 



For a cheap and easy test of the true value of lubricating oils. Silver Medal. 



For an easy and economical method of procuring the pure fatty 



acids from crude materials • • • • Silver Medal. 



For an important discovery or invention in photography Silver Medal. 



For the best original research upon the artificial formation of % 



saltpeter. Silver Medal. 



For an easy test of the detergent strength of soaps Silver Medal. . 



For the best specimens of silver or gold plating oa glass Silver Medal. 



For a cheap preparation of aniline colors Silver Medal. 



For a cheap preparation of metallic calcium Silver Medal. 



For a cheap preparation of silicium Silver Medal. 



For a cheap preparation of magnesium Silver Medal. 



For the best mode of constructing fire proof buildings Silver Medal. 



For a simple method of crystallizing sugar from sorghum. . .Silver Medal. 



For the best water meter Silver Medal. 



For the best lamp to burn kerosene oil, producing perfect 



combustion Silver Medal. 



For the best plan for burning kerosene oil for heating pur- 

 poses .• Silver Medal. 



Three discretionary premiums (gold or silver medals)— to be determined by 

 the board of managers. 



Mr. Dibben.— I see Mr. Johnson here, who is a member of the board of 

 managers, and I would like to ask what steps are to be taken to inform 

 those'who would be likely to compete for them, in regard to the subjects 

 for which premiums are offered by the Institute ? 



Mr. Johnson.— The managers will furnish the Association with circulars 

 for distribution. 



Mr. Rowell exhibited an instrument for showing the temperature at 

 which coal oil ignites. Mr. G. Tagliabue is the inventor and maker. lu 

 Europe no oil is allowed to be sold, for illuminating purposes, which 

 ignites at less than 115°. 



Prof. Seely.— I think the instrument good, but not all that is needed. If 

 oil is shaken, even at 90^, we may have an explosive mixture. This 

 is the best instrument I have seen. 



Mr. Johnson said he had found no difficulty in setting fire to all the oils 



he had tried. 



Mr. Rowell.— I have tried many times and found that the vapor of oil 

 would not ignite -below 1 1 0« in this instrument. It is to test the compara- 

 tive explosibility of oils, to show which are comparatively safe. 



