CLAYS OF MERCER COUNTY. 433 



Glen Moore. — A white micaceous and very porous clayey sand, 

 apparently disintegrated Triassic sandstone, is found at Glen 

 Moore on property of G. C. Macauley (Lab. No. 732). A 

 sample sent to the Survey was loose and hard to mold. It 

 burned a loose white brick at cone 1, and had an absorption of 

 20.96 per cent. An attempt has been made to use it in fire brick 

 in place of "feldspar" sand, but with unsatisfactory results, as it 

 was found to lower the fusion point somewhat. 



Clay-working Industry. 



The value of the clay products produced annually in Mercer 

 county is very great for the reason that it includes the pottery 

 industry at Trenton. At the same time very little of the raw 

 • material used by the factories is obtained from within the limits 

 of the county itself. Common brick have been produced in large 

 quantities for a number of years in the region around Trenton, as 

 mentioned under the history of the brick industry, on page 243,. 

 and in addition to those produced at this point, others are also 

 manufactured near Hightstown. Pressed brick are made from 

 the clay loams at several of the yards at Trenton, but at no other 

 locality in the county, and draintile are made to a small extent at 

 Trenton, as well as at Hightstown. The most important branch 

 of the clay-working industry in Mercer county is the manufacture 

 of pottery. The products produced at Trenton include white 

 earthenware, semiporcelain, C. C. ware, sanitary ware, belleek, 

 electrical porcelain, etc. Floor and wall tiles are also made at 

 several factories in Trenton, and there are two factories engaged 

 in the manufacture of fire brick. A list of the potteries is given 

 at the end of Chapter XV (p. 305). 



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