HANDLING OF EAW MATERIALS. 



319 



this as3ociatioQ of the greatest possible speed with the automatic 



working of the trucks, and 



certainly the solution of the 



problem should attract the 



attention of manufacturers, 



for it effects a remarkable 



saving in the working ex- 



■^^^^^^v^^^■.<^^■, '■■.'- '-^^C't 



penses of factories, particu- 

 larly in chemical works. 

 When the railway is on a 

 level a single motor suffices, 

 the rigid rail being generally 

 fixed on a level. But in 

 most cases it is necessary 

 to span a difference of 

 level between the point of 

 departure and the point of 

 arrival. It would be, more- 

 over, very onerous to wish 

 to employ a uniform slope 

 throughout all the path of 

 the raihvay, for it would in- 

 volve a considerable expendi- 

 ture of energy and a costly 

 construction. 



The Bleichert system 

 overcomes the difficultv in 

 a practical manner by inter- 

 posing in the network, sus- 

 pended on bearings, trunk 

 ways wdth desired incline, 

 spanning the out of level 

 w^hilst preserving enough free 

 space to allow the w^beels not 

 to lose contact w^ith the rail- 

 wav, and the bins to maintain 

 their natural movement of 

 oscillation. The advantage of 

 this system consists especi- 

 ally in the fact that the limit 

 need not be taken into ac- 

 count, for the sections are 

 spanned by aid of organs 

 absolutely independent of the 

 driving of the cars. For this purpose the carrying track becomes a 

 strong stair and rejoins in a few metres an upper part on bearings, 



I- 



