494 WRITINGS OF JOSEPH HENRY. [1873 



ExperiTTients of Mixing Oils with Oil of Vitriol of 66° Beaume, 



at 62° F. 



[Of oil, 2 fluid ounces; of sulphuric acid, 1 fluid ounce.] 



First experiment. — Winter-pressed lard oil. 



Temperature of oil before mixing 70° F. 



Temperature of oil after slow mixing 130" 



Difference 60° 



At the expiration of 3 minutes, temperature 134° 



At the expiration of 4 minutes, temperature 134° 



Second experiment. — Winter-pressed lard oil. 



Temperature before mixing 70° F. 



Temperature after mixing rapidly 169° 



Difference 99° 



Third experiment. — Winter-pressed lard oil. 



Temperature before mixing , 70° F. 



Temperature after mixing 165° 



Difference 95° 



Fourth experiment. — Crude lard oil. 



Temperature before mixing 66° F. 



Temperature after mixing 164° 



Difference 98° 



Refrigeration of Oils. 



Those experimented upon were whale, sperm, refined lard, 

 and crude lard oils. 



First eocperiment. — At 30*2° F.' they were all sirupy ; in the crude lard 

 oil a yellowish solid began to separate. 



At 26-6° the sperm oil began to solidify. 



At 24-8° the refined lard oil began to yield a white precipitate. 



At 17-6° the whale oil was a thick sirup, without deposit. The crude 

 lard oil was quite hard. The pure lard oil was not as hard as the crude lard 

 oil. The sperm oil was not as hard as the pure lard oil. These experiments 

 performed in test tubes. 



Second experiment. — Upon pure winter-pressed lard oil, in a test tube. 

 At 17-6° F., it begins to deposit flakes of solid matter. 

 At 14° it is quite thick. 

 At 10'4° it is perfectly solid. 



