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The basic principle of a cantilever bridge is that the bridge is supported entirely at one end, the rest being held in place by steel pillars or beams.
There have been several London Bridges over the centuries. The present bridge was built in 1973. It's predecessor, built in 1820, was disamantled to make way for the present bridge, The 1820 bridge was re-assembled at Lake Havasu City in Arizona and is open to the public as a tourist attraction. It is a widely held belief that the buyers of London Bridge thought that they were buying Tower Bridge, but the buyers and the sellers have both denied this.
because it held a cable
a suspension bridge is a bridge that is held by large cables tied to poles.
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They often were held in churches. The minister was the teacher. In the 1800's schools were built and it was a one room schoolhouse with all grades in the room.
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1892
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The Covered Bridge Festival is held every year in Parke County