126 ECONOMICAL 6E0L06T. 



Tuckahoe Eiver, past Tuckahoe, to Marshallville, where 

 it has been used for making bricks. Clay has also been 

 dug and used quite extensively for brick making, by Peter 

 Corson, Esq., at Petersburg. The clay is seen at other 

 places to the southwest of Petersburg, along the Great 

 Cedar Swamp Valley, but has not been worked. I do not 

 know that there has been any attempt at brick making in 

 the county, except the above. There is some clay near 

 Cresse Town, but it has not been worked. 



Some of the clay at Petersburg is nearly white. Fire 

 bricks were made from it by Mr. Corson, some years since. 

 White clay is also found on the borders of the cedar 

 swamp, on the land of W. S. Townsend, Esq., at Dennis- 

 ville. There is also white clay found near East Creek, 

 on the land of Mr. Dan Bishop, as I am informed by Judge 

 Goffe, who tested it by boring, some years since. He 

 thinks the layer is four feet thick. 



A kind of concrete brick has been made from gravel, 

 which promises to be a cheap and durable building mate- 

 rial. The bricks, or rather blocks, for they are of large 

 size, are made by mixing the gravel with lime and water, 

 and then forming them in moulds. They harden by ex- 

 posure to the sun and air, and are not burned. The 

 gravel used may have sand in it, without injury; but 

 it must be free from loam. Good stone lime should be 

 used, in the proportion of one bushel of lime to twelve of 

 gravel. 



In making the bricks, the gravel is laid on a common 

 mortar bed; and the lime, which has been previously 

 slaked and made into a thin putty in a lime trough, is 



