8 



will be stationed at the end near the joint. For facilities in 

 manipulation, the cylinders of the hydraulic gears are to be made 

 cellular, so that they may be in a state of indifferent equili- 

 brium when in water. 



The next operation will be to place the guy anchors, E and 

 F {Fig. 4), and attach their cables G to the bridge to resist 

 tidal currents. The anchor, E, is to be an ordinary one with 

 fixed flukes ; F to be made of concrete. These anchors may 

 be either separate or self-contained ; — the ordinary one to resist 

 the dragging tendency, and the concrete one to resist the 

 resultant upward force. This combination is adopted with a 

 view to reduce the length of the guy cables to within reasonable 

 limits. When a pair of these anchors, with their cables 

 attached, have been placed on each side of the bridge, the one pair 

 directly opposite the other, the free ends of the cables are to 

 be led on to a lighter and attached to hauling gear and strained 

 in position to twice the working stress : — thus the two cables 

 with their anchors will be tested at one operation. The upper 

 ends of the cables are to be then rove through stuffing boxes 

 near the outer end of the length of the bridge under manipu- 

 lation, and attached to screws or barrels within the bridge, 

 where they can be adjusted at any time, and be always accessible 

 from the inside of the bridge after completion. The guy 

 cables are to be coated with an impervious covering of substance 

 lighter than water, in order to render them buoyant and so 

 prevent any sag. 



The vertical cables H, and concrete anchors I {Figs. 1 and 4)5 

 are then to be dealt with. Before the lengths leave the works 

 on shore, these cables are to be cut to the exact lengths, and 

 their upper ends rove through stuffing boxes isTand secured to 

 the adjusting nipper screws or barrels L (Fig. 2), which will be 

 always accessible from the inside of the bridge. The cables are to 

 be coiled and lashed to the length of the bridge for convenience. 



A specially designed lighter must be used to carry four or six 

 concrete anchors from the works on shore. When the cables 

 are attached to their anchors, two of the latter are to be 



