THE CLAY-MINING INDUSTRY. 341 



distinct from the clay manufacturer is most prominent, the 

 clay dug and sold raw is probably not more than one-half the 

 total amount dug, and the total amount of clay dug in the entire 

 State must be many times these figures. 



SHIPMENTS TO OTHER STATES. 



The most interesting feature of the New Jersey clay-mining 

 industry, however, is its important relation to the production of 

 clay products in the other States, many of the largest firms in New 

 York, Pennsylvania, and adjoining States drawing on the New 

 Jersey pits for their supply of raw materials. In order to deter- 

 mine the quantity of clay shipped to points outside the State in 

 1902, a letter of inquiry was sent to the different clay-mining 

 firms, and replies were received from all those active in that year 

 with the exception of a few small ones. The results received 

 from twenty- four miners when tabulated gave the following : 



Amount of clay shipped from New Jersey to other states in 1902. 



Number of 

 State. Long tons. firms shipping. 



Pennsylvania, 56,482 15 



New York, 27,636 18 



Ohio, 24,039 8 



Maine, 20,266 3 



Connecticut, 9.985 8 



Massachusetts, 5,405 14 



Maryland 2,727 5 



New Hampshire, 1,557 3 



Canada ." 1,676 3 



West Virginia, 897 4 



Rhode Island and Wisconsin, i,343 4 



152,013 



This amount, as can be seen by reference to the statistics pre- 

 ceding it, represents about 30 per cent, of the clay mined in New 

 Jersey and sold raw. At the time the statistics were collected in- 

 quiries were also made regarding the uses of the materials shipped. 

 These as far as ascertainable were as follows : stoneware, saggers, 

 white brick, terra cotta, gas works, forges, steel works, sanitary 



