DESCRIPTION OF THE APPARATUS. 



15 



chamber extends only to the line >i v\ Avhich is 5 inches above the 

 base. (See fig. 4.) This side is left partially open to facilitate the 

 lighting of the burners and to give a better supply of air. A 2-inch 



= = 3 



.-J -*» — 





(R 



•d - r< 



«5. I 



hole should likewise be cut in each end of the apparatus about U 

 inches from the base, in order to give a greater supply of air to the 

 two end burners; this, however, is not shown in the illustrations. 

 The different parts of the evaporating chamber, including the 



90 



