130 



CEMENT AND CONCRETE 



c) It may be elevated by buckets and hoisting appa- 

 ratus. 



Where the concrete is mixed by hand, it is usually trans- 

 ported by wheelbarrow (Fig. 142). For machine-mixed con- 

 crete where the work is of some magnitude, some flexible 



FIG. 142. Moving concrete with wheelbarrow. 



method of handling it is best, usually a tower with elevating 

 equipment. Derricks and bucket elevators are also used. 

 The one objection to the use of tower and chutes is the tend- 

 ency, in order to secure easy flow, to use too much water, 

 causing a separation of the fine and coarse aggregate. 



