712 NEW YORK STATE MUSEUM 



deep blue color, tlie upper 10 feet being somewhat sandy. It bas 

 been bored to a deptb of 60 feet in places, but this depth is not con- 

 stant, and in spots the underlying limestone rises to within a, few 

 feet of the surface. The sand for tempering has to be brought 2 

 miles. The following is an analysis of the clay. 



Silica ... 49 . 20 



Alumina 17 . 47 



Peroxid of iron 6.23 



Lime 7.86 



Magnesia 4.87 



Alkalis 9.82 



95.45 



Only common brick are made. Soft mud machines are used. 

 Drying is done in the sun and burning in scoverkilns. The bricks 

 have been largely used in the asylum buildings at Ogdensburg. 



Macirid, St Lawrence co. Three miles north of the depot is 

 the brick yard of Robert Watson. The clay is of a blue color and 

 about 20 feet thick. The section is 



Yellow sand 3 feet 



Blue clay 20 " 



The bottom has not yet been struck. Horse power is used for 

 operating the machinery. The clay has to be tempered with sand. 

 Drying is done on pallets or in the sun. Burning takes about one 

 week. The consumption is local. 



Raymondville, St Lawrence co. William Coats's works are at 

 Raymondville, about 7 miles nv.rth of ISTorwood. The clay bank 

 lies on the east side of the Racket river. It is about 25 feet 

 in thickness and there is a covering of 12 feet of fine sand. The 

 clay is rather tough and requires an admixture about one third sand 

 for making brick. An abundance of unworked clay is still in sight. 



