Miscellanies. 



183 



not therefore go into details except to describe the 



nace, the exact dimensions of which we have been able to procure. 



cementing fur- 



Figs. 1, 2, and 3, show the arrangement of the furnace. 



It 



is 



rectan 



Fig. 1 . 





mg troughs C, constructed of brick.* These troughs are two and 

 a half feet wide, three feet deep, and twelve feet long; they are 

 placed on each side of the grate, A, B, fig. 2 ; the latter extends 



* These troughs arc sometimes made ot refractory stoue 





