XII. W. H. WARREN. 
levers is 720’ long and 160’ deep. The trusses spanning the shore 
intervals, each of 910’ in length, are not heavy enough to balance 
the weight of the centre span, and the four abutment cylinders 
are hollow; the end of the shore trusses are to rest on rollers or 
some equivalent on the tops of these piers, and are to be held 
down by pig iron weights suspended from their ends and hanging 
within these piers, and representing an aggregate weight of about 
14,000 tons. The floor of the bridge will accomodate six railway 
tracks. 
The suspension bridge proposed consists of steel towers 557’ in 
height, resting upon foundations of solid masonry extending to 4 
depth of 125’ below high water. The bridge will be 125’ wide, 
and will be suspended from twelve steel cables, with a clear head- 
way for ship traffic of 150’. The cost of this bridge is guaranteed 
by the Union Bridge Company not to exceed £5,000,000. Mr. 
Theodore Cooper is the consulting engineer for this enormous 
structure and there are several points in his specification which 
are worthy of notice :—“ The bridge will have six standard rail- 
way tracks upon one level. The general type of the proposed 
bridge will be a steel wire suspension bridge, stiffened for moving 
loads by longitudinal girders extending from tower to tower. The 
main span only, or that portion between the towers will be carried 
by the cables. The side spans or that portion between the towers 
and anchorages will be carried upon viaducts independent of the 
cables. The towers will be steel skeleton structures, commencing 
at an elevation about fifty feet. above high water, where the 
masonry piers end, All the connections must be rivetted, and all 
( the bracing must be rigid. The stiffening truss will be rivetted 
lattice girders, with multiple systems of diagonal web bracing: 
They may be continuous from tower to tower, or they may be 
made with a central hinge at the option of the contractor.” The 
dead load will consist of the weight of metal in the structure, and 
the weight of rails, ties, guards, footwalks etc., above the longi- 
tudinal track girders shall be taken as 400 tbs. per lineal foot per 
track. The live load shall consist of trains weighing 3,000 = 
