28 



NEW YORK STATE MUSEUM 



It would seem from experience that the circular down-draft kiln has 

 some advantages in temperature regulation. The continuous kiln in 

 use for the burning of paving brick, in this State at present, is of 

 the Haight type. This consists in form of two rectangular kilns 

 placed in parallel position and connected at both ends by a semi- 

 circular extension of the same cross-section. The kiln is divided 

 into fifty-five chambers and after the original fire is started it is a 

 continuous operation of setting, burning, cooling, and emptying. 

 This kiln is top fired, using bituminous coal, the fire being con- 

 trolled and regulated by dampers. The waste heat, in cooling, is 

 carried over to a forward chamber and assists in drying. As soon 

 as a compartment is burned, the fire is transferred ahead to the next 

 and the first begins to cool. In this manner, the fire is carried com- 

 pletely around the kiln. 



With one exception, railroad transportation is the only method 

 available for the shipment of the finished product to the markets. 

 The local brick are sold in New York, New England and the South- 

 ern States. 



The figures in the following table show the annual production of 

 vitrified brick in New York State from 1897 to date. The figures 

 for 1897 and 1898 are taken from the " Mineral Industry," those for 

 1899 to 1903 inclusive from the " Mineral Resources of the United 

 States," and those from 1904 to date from the publications of the 

 New York State Museum. 



YEAR 



QUANTITY 



VALUE 

 PER M 



NUMBER 



OF 

 PLANTS 



1897 

 1898 

 1899 

 I9OO 

 1901 

 I902 

 I903 

 I904 



1905 

 I906 

 I907 

 I908 

 I9O9 

 I9IO 

 I9II 

 1912 

 1913 



19 849 OOO 



18 233 000 

 32 233 000 

 29 943 000 

 29 950 000 

 27 009 000 

 16 797 000 

 16 351 000 



13 984 000 



11 472 000 



12 296 000 



14 570 000 

 12 278 000 



19 762 000 

 23 993 000 

 18 249 000 

 35 666 000 



$209 124 



177 968 

 342 845 

 347 671 

 342 342 

 322 250 

 220 296 



210 707 

 180 004 



178 on 

 184 306 



211 289 

 207 970 

 333 5ii 

 388 479 

 382 984 

 576 970 



'io 53 



9 75 



10 60 



n 61 



46 



93 

 n 



11 

 11 



13 



12 88 



12 87 



15 51 

 14 98 



14 50 



16 27 

 16 88 

 16 19 



15 78 



16 17 



