220 



TABLE 217. 

 FREEZING MIXTURES. 



Column i gives the name of the principal refrigerating substance, A the proportion of that substance, B the propor- 

 tion of a second substance named in the column, C the proportion of a third substance, D the temperature of the 

 substances before mixture, E the temperature of the mixture, .Fthe lowering of temperature, G the temperature 

 when all snow is melted, when snow is used, and H the amount of heat absorbed in heat units (small calories wheu 

 A is grammes). Temperatures are in Centigrade degrees. 



* Compiled from the results of Gailletet and Colardeau, Hammerl, Hanamann, Moritz, Pfanndler, Rudorf, and 

 Tollinger. 



t Lowest temperature obtained. 



SMITHSONIAN TABLES. 



