Manual of military engineering . Weiler&Gradam. L!r pouje 51. CHAPTER XIV.—BRIDGES. 57 141. The same nature of roadway can be applied to cacli Construc-type of bridge, and its usual form is shown in PL 50, Fig. 1. ^^^^ ^^ The planks or chesses, A, A, placed across the width of ^^^^ ^*^roadway are supported on longitudinal baulks or road-bearers,B, B, which in their turn rest on transverse transoms, T, T, andthe method of supporting these last depends on the type ofbridge. The chesses are kept steady by two ribands, R, R,which are secured to the outside baulks either by rac
Manual of military engineering . Weiler&Gradam. L!r pouje 51. CHAPTER XIV.—BRIDGES. 57 141. The same nature of roadway can be applied to cacli Construc-type of bridge, and its usual form is shown in PL 50, Fig. 1. ^^^^ ^^ The planks or chesses, A, A, placed across the width of ^^^^ ^*^roadway are supported on longitudinal baulks or road-bearers,B, B, which in their turn rest on transverse transoms, T, T, andthe method of supporting these last depends on the type ofbridge. The chesses are kept steady by two ribands, R, R,which are secured to the outside baulks either by rack lashingsor by lacing, or the chesses may be simply nailed down. 142. A width of 8 feet in the clear—^.e., the clear space between Width ofthe ribands—suffices for infantry in fours, for military vehicles in direction, and for c&Yalvj in. half-sections—, two abreast; but 9 feet in the clear is a better width, especially when there islikely to be a sway on the roadway, as frequently happens inthe
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