350 



WOOD TRANSPORT BY LAND. 



sleeper was equally cheap. However, the construction of the 

 wire-tramway reduced this charge by 25 % from 1 anna to 

 8 pies. The gradients are 26 and 27 degrees for single 

 wire and 31 J degrees for double wire. Tr.] 



2. Single Wire-Tramways. 



In single-wire tramways, the laden and empty trucks travel 

 at the same time on a single wire ; otherwise their construc- 

 tion is similar to that of the double- wire tramways, the only 

 peculiarity in this case being the arrangement for allowing the 

 empty and laden trucks to pass one another on the wire. 



Fig. 227. -Transfer station. 



To allow for the possibility of this, at the middle of 

 the wire, where the trucks cross one another, a so-called 

 transfer-station is arranged as follows : a workman stationed 

 on a scaffolding lifts the empty truck from the wire and 

 replaces it beyond the descending truck so as to allow the 

 latter to pass. 



An automatic siding has, however, been invented, as shown 

 in Fig. 227 : at a short distance above the wire, is fixed, on the 

 poles (c d) which serve to support it, a rod (e c df) for the 

 passage of the empty truck. The part of this (e c), jointed to 

 the remainder by a hinge at (c), has also a counterpoise, so 

 that it remains parallel to the wire unless pressed-down by the 

 weight of the truck, (c d) is fixed parallel to the wire, and (df) 

 is also jointed at (d) and meets the wire at (/). The empty 



