^HANDLING OF EAW MATEEIALS. 



327 



but it would be impossible for them to advance owmg to the block- 

 ing of the line, and they would be forced to arrange themselves at 

 regular intervals along the line. As soon as the charged truck 

 starts, the following one advances automatically and stops at the 

 hopper to receive its charge. The other trucks follow the lead 

 and advance one after the other until their turn comes to take then- 

 place at the hopper, and the same routine goes on contmuously. 



As already mentioned, all supervision during the journey is 

 absolutely superfluous, the trucks are unloaded automatically, tor 



Fig. 64. — Electric Conveying Car tilting Contents into Silo. 



the bolts which hinder the bin from tilting or which keep the sides 

 of the bin closed, unlatch themselves during the working by means 

 of a bolt. Owing to these arrangements it is possible to obtain 

 crreat traffic on the whole line. These aerial railways on the electric 

 automatic system may be supported outside the building on wood 

 or metal brackets, leaving below them the necessary freedom for 

 working in the factory and assuming, consequently, shapes ap- 

 propria'te thereto. At other times, as a measure of simplification 

 or economy, these rails are hooked on to wall brackets or even to 



