AMERICAN INDUSTRIES SINCE COLUMBUS. 317 



in the two fire-boxes P R, after traversing the heating-chamber 

 Q, could only reach the chimney by passing out of the door Y. 

 This arrangement 

 was not calculat- 

 ed to produce a 

 very rapid com- 

 bustion of the 

 fuel, and there- 

 fore large fire- 

 boxes were neces- 

 sary. The dimen- 

 sions of this fur- 

 nace would not 

 be thought small 

 even at the pres- 

 ent time, for the 

 heating - chamber 

 Q was ten and a 

 half feet long and 

 seven feet wide, 

 and the two fire- 

 boxes were each 

 four feet square. 



The above con- 

 struction of slit- 

 ting-mills was not 

 the initial form ; 

 for in that, the 

 axes of the rolls 

 and cutters, in- 

 stead of being in 

 the same, were in 

 parallel planes, 

 and instead of be- 

 ing driven direct- 

 ly from the water- 

 wheels, there was 

 interposed be- 

 tween the water- 

 wheel shafts and 

 those of the rolls 

 and cutters some 

 clumsy wooden 

 gearing. Fig. 19 

 ( from Sweden - 

 borg ) shows a 



