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With the stone in place, all its weight is now lost into the ground as the circular motion of the roller puts everything into balance. It would take only a few people to pull the stone on a flat surface, although much more effort would be needed on a steep hill.
The critical advantage of this method is that on arrival at the sea there is no lifting of the stone onto a boat. The complete assembly is simply rolled into the sea. When the roller is in the water it can then be supported by tree-trunks lashed to the casing and sailed away, just like a raft. On arrival at the other side, the stone may simply be rolled onto the beach and then overland directly to Stonehenge.
Bruce Bedlam believes the simplest route for the Bluestones would then have been across the Somerset Levels to Stonehenge. There are no hills or steep inclines to encounter on this route.
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