476 



Farm Mechanics. 



how such Herculean tasks as the ancient Roman roads could 

 be accomplished. But happily, the use of steel and inani- 

 mate forces is freeing man from such drudgery ; and in 

 Figs. 227 and 228 are two views of a rock crusher at work, 

 breaking stone, sorting it and delivering it into bins 

 where it may easily be dropped into wagons for delivery 

 upon the road. 



Fio. 227. View of No 2 Anst'n rmciip r . with rovolvincr SPVPPTI breaking 

 boulders for road; and wagon loading coarsest grade of broken stone. 



At the time these views were taken the crusher was be- 

 ing driven by a 22 H. P. traction engine and was crushing 

 rock at the rate of 100 wagon loads per day. The material 

 is separated into three sizes, the coarsest used for the foun- 

 dation, the intermediate for the wearing surface and the 

 finest as binding and surfacing material, and Fig. 227 

 {hows a wagon loading with the foundation size, and Fig. 

 28 with the screenings or binding material. 



There are various forms of crushers on the market ann 

 Fig. 216 represents another type. 



