HIGHWAY CONSTRUCTION 



T,7 



moving heavy broken stone, etc., or it may be employee! with ad- 

 vantage in the cleaning department. Capacity from ,'* to 4 cubic 

 feet. Weight from 70 to 82 Ib. 



Fig. 37. Steel Tray Barrow. 



The maximun distance to which earth can be moved economic- 

 ally in barrows is about 200 feet. The wheeling should be per- 

 formed upon planks, whose steepest inclination should not exceed 1 

 in 12. The force required to move a barrow on a plank is about ^ 

 part of the weight; on hard dry earth, about T * T part of the weight. 



Fig. 38. Metal Barrow. 



The time occupied in loading a barrow will vary with the 

 character of the material and the proportion of wheelers to shovel- 

 lers. Approximately, a shoveller takes about as long to fill a barrow 

 with earth as a wheeler takes to wheel a full barrow a distance of 

 about 100 or 120 feet on a horizontal plank and return with the 

 empty barrow. 



Carts. The cart usually employed for hauling earth, etc., is 

 shown in Fig. 39. The average capacity is 22 cubic feet, and the 

 average weight is 800 Ib. These carts are usually furnished with 

 broad tires, and the body is so balanced that the load is evenly 

 divided about the axle. 



