342 



L.AJS'D-TRANSPOKT. 



loiif,' on the portable lines, and a section must not be heavier 

 than a man can carry (i\}r. 182), i.e., 35 — 45 k^^ (75 — 100 lbs.). 

 Whilst on the main lines consecutive rails are fastened to'^etber 



by plates and bolts, in the portable portions they must be 

 attached so as to link and unlink with one another quite easily, 

 as shown in fi<jf. 183. 



Fig. 183. 



As re^^ards the ^"au'^e, experience shows that ior main lincj- 

 70 centimeters (27 inches), and for portable portions GO centi- 



isi. 



meters (23 inches), arc most suitable.* Junctions are eflected 

 on the main lines by a combination known as switch and points, 

 a description of which may be seen in Dempsey's Practical 

 Kailway Enj^aneer, but on the portable lines a junction is more 



So Oavcr, liut flian^o of ''nw'c is of iloiibtful 



