. The roads and railroads, vehicles, and modes of travelling, of ancient and modern countries; with accounts of bridges, tunnels and canals, in various parts of the world . uently sufficient-to produce a rupture. It is statedthat a suspension-bridge at Broughton, near Manchester,was broken down, in April, 1831, by a party of sixtysoldiers marching over it to a tune on a fife. The bridgewould have borne more than double the weight if themen had gone over it in an irregular step; but theequal timedness of the march produced so great an oscil-lation in the main chains, as to break them. It has be
. The roads and railroads, vehicles, and modes of travelling, of ancient and modern countries; with accounts of bridges, tunnels and canals, in various parts of the world . uently sufficient-to produce a rupture. It is statedthat a suspension-bridge at Broughton, near Manchester,was broken down, in April, 1831, by a party of sixtysoldiers marching over it to a tune on a fife. The bridgewould have borne more than double the weight if themen had gone over it in an irregular step; but theequal timedness of the march produced so great an oscil-lation in the main chains, as to break them. It has beensuggested that the damage done to the Brighton pierwas by gusts of wind acting probably at equal intervals oftime. 134 HAMMERSMITH BRIDGE. There is a very fine suspension-bridge at Fribourg, inSwitzerland, constructed with Avire-cables by M. Chaley,the French engineer. We may also remind tlie reader ofthe fine structure at Hammersmith, designed and erectedby Mr. W. T. Clark, which presents the peculiarity of partof the road-Avay being supported on, and not hanging from,the main chains. This bridge was opened in 1827, after having beenabout three years in ELimmersmith Su-speEsion Bridge.
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