172 NEW YORK STATE MUSEUM 



special objection to this unless the pebbles are limestone and then 

 they should not be allowed to enter the brick. Several forms of 

 machines have been invented which, it is claimed, break up the 

 clay and separate the pebbles at the same time. 



Barrel sieves are sometimes used to get rid of pebbles in 

 the clay. In this case the clay has to be first dried and 

 broken up. 



Dry clay process 



The introduction of this method in the United States dates 

 back 15 or 20 years only, it having been first introduced at 

 Louisville, Ky. In New York it has not been in use over five 



Dry clay plant. 



years, and there are only five machines in use in the state. 

 The clay after being dug is usually stored in sheds to dry. When 

 ready for use it is taken out and charged into the disintegrator 

 or dry pan, preferably the latter. Dry pans have been described 

 in connection with the stiff mud process ; as to disintegrators the 



