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Built 1869-72. Spans of about 325 feet of "fish-belly" form, built of wrought iron; the upper chord consists in itself of two chords and panel bracing, as does likewise the lower chord, and the two are connected by vertical suspension rods only, these suspension rods holding up the track construction. The constructive analysis of the bridge makes it an arched bridge, with parallel chords and panel bracing, supported on towers erected on the piers, the height of the towers equal to the deflection of the stiffened suspension bridge structure (above spoken of as the lower chord of the "fish-belly" bridge), and whose sole office is to neutralize the thrust of the arch. The bridge platform, or track construction, is tangent to this double lower chord, and is supported from the arch by suspension members. A comparison of the weight of this bridge with others of like span and strain on the materials of construction, shows it to be a favorable form of bridge-truss, as far as own weights are concerned.