228 



NEW YOKE. STATE MUSEUM 



Oxide of iron 3.72 



Alkalies 8.85 



Water 7.49 



101.62 



We give here an analysis of the shale at lath's yards : 



Silica 65.15 



Alumina 15 .29 



Oxide of iron 6.16 



Lime 3.50 



Magnesia 1.57 



Alkalies 5.71 



97.38 



J. Lyth & Son also manufacture hollow brick and terra cotta 

 lumber. 



Rochester. Otis & Gorsline use a mixture of New Jersey 

 fire clay and a quarternary clay obtained from Chili near Eoches- 



Circular down-draft kiln for tiles, etc. 



ter. The method of manufacture followed by them is very simi- 

 lar to that at Angola. Rectangular kilns are however used for 

 burning, which takes about one week. 



Sewer pipe are also manufactured at Albanv and Trov but from 

 New^ Jersey clays. 



