INVESTIGATIONS RELATIVE TO ILLUMINATING MATERIALS. 495 

 ORGANIC ANALYSES OF LIGHT-HOUSE OILS. 



i^o. 1. — Refined winter -pressed lard-oil. 



EXPERIMENTS OF MIXING OILS WITH OIL OF VITRIOL OF 6G'=> BEAU:ME, 



AT C20 F. 



First experiment. — Winter-pressed lard-oil. 



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



Temperature of oil before nixing 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 ^^° 



