238 FARM MACHINERY 



337. Sacking elevators. When desired, all larger ma- 

 chines may be obtained with a sacking elevator, provided 

 with a divided spout, to which two sacks may be attached 

 at a time. While one sack is filling, the other may be 

 removed and an empty sack adjusted in its place. 



338. The selection of a feed mill. Feed mills for farm 

 purposes should have their frames constructed of cast 



FIG. 178 A SECTIONAL VIEW OF A POWER MILL WITH DUPLEX BUHRS AND 

 CRUSHING KNIVES 



iron, in such a way that there is no binding in the bearings 

 and all bearings may be well protected from the dust. 

 The buhrs should have a device to release them when 

 some foreign substance, such as stones, nails, nuts, 

 etc., enters the mills. Besides this safety device there 

 must be another which is handy and will regulate the 



