214 



CHAPTER XI 



spur wheels ; 3, the second motion pinions ; and 4, the second motion spur 

 wheels. A common modification of this train is to make of double width 

 that second motion pinion coacting with two spur wheels, so that the double 



FIG. 119 



load may be distributed. When four or more mills'. are laid out in one 

 train, two engines are generally used, practice being divided between driving 

 the mills three and one, or two and two. 



In the earlier g-roller trains the second motion spur wheels were carried 



FIG. 120 



on high pedestals, as indicated in elevation in Fig. 123, stability being aided 

 by tying the pedestals together. As fracture of the pedestal was frequent, 

 it is customary at present to arrange the centres of spur wheels and pinions 



