;5;3G 



LAND-TKANSPOKT, 



more, and should be steepest above and become gradually level 

 below. Although slides should be as straight as possible, and 



177. 



free from sudden curves and angles, this principle may be 

 departed from if the direction of the slide has to change suddenly. 

 A barrier is then erected at the end of a section of the slide at 



