136 INDEX 



Page 



Transverse contour '. 30, 78 



Transverse grade 77 



Trap rock 83 



Trinidad asphaltum 107 



Undulating grades 27 



Vehicles, effect of springs on 11 



Water on mountain roads 22 



Water breaks 37 



Wheelbarrows 56 



Width of road 29 



Wood pavements 101 



advantages 102 



chemical treatment of wood 103 



creosoting 103 



defects 103 



expansion of blocks 105 



filling for joints 106 



manner of laying .' 105 



quality of wood 1 03 



Zigzags 21 



