Chap. XXIII.
1375
maintained in their places by twenty-four pendant vertical binding-pieces, put at a distanceof about 16 feet from centre to centre. The ridge of the roof of this bridge, as well as thatof SchaufThausen, was supported in the centre by inclined struts, which carried the weight
nearly to the extremities. This is the greatest span ever executed with timber, and itsradius of curvature, or curve of equilibrium, was about 600 feet.
Bridye at Zurich has a bearing of 128 fret, and is extremely simple in its construction ;the floor or platform of the bridge is sustained upon longitudinal timbers which increase in
Fig. 2257.
BRIDGE AT ZURICH.
thickness towards the abutments ; they are sustained in a level position by eight pendantbinding-pieces, attached to another longitudinal series of beams, which are strutted onto the abutments by eight variously inclined struts on each side.
Bridge at Ceslingen , over the Necker , upwards of 210 feet between the abutments, is anotherfine example of similar construction.
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I'ig 2258.
Fig. 2259.