49 



The essential machinery, in general, is a mixer and 

 hoist, with their power, steam, gasoline or electricity 

 as it may be. The machinery must be located some- 

 where between your raw material, sand and aggregate, 

 and your product, the concrete in the pouring; keep 

 before you always the fact that the material from ce- 

 ment shed and sand-pile, to concrete in the forms, 

 must be handled the least number of times. 



Handling Material. It seems as though light port- 

 able mast derricks could be used economically to handle 

 concrete materials, both in front of and behind the 

 Bottom or side dumping buckets are coming 

 into general use, and small commercial railways. It 

 will pay the construction man to study thoroughly any 

 piece of work and decide upon the most efficient way 

 of handling his material cableways, tramway, derrick, 

 wheelbarrows or gravity. Consider the merit and com- 

 parative efficiency of each method. 



Use gravity to save labor; make the attraction of the 

 earth move your aggregate into the mixer. In other 

 . put y'iir mixer as low as possible in order to 

 wheeling up steep inclines. 



Put the mixer in the excavation and dump the mate- 

 rials in the -tivet outside. Load into the hopper behind 

 ixer with barrows, buggies or belt conveyors. 

 ! the mach.ii: ; below ground, or 



. er material is handled <>ver the mixer or engine, 

 the flooring over the mixer should be grit-tight. Place 

 ! around any opening, such as required for 

 etc. 



1 more crushed stone if planks are 



M .nd. Clean all rubbish off the site for 



pile before unloading sand or stone. This 



h will work uj> -natem! and consequently 



ir in the concrete. 



P.rini; rj cars of material as closely to the mixing 

 ' lior in handling concrete 



