P A N E L T H R E E
How to rotate it
Once a satisfactory method of moving the the replica stone had been worked out, the team turned their minds to the problem of raising it.
They recreated the shape of the holes discovered in 1923, adding a concrete pivot block at the leading edge to provide a stable point around which the block could pivot accurately.
The diagrams illustrate the rotation sequence. The 'tipping point' of the block was moved forward to make rotation possible using less manpower. The presence of the pivot block raised the stone's pivot axis, plus additional stones were placed on top and moved forwards to tip the balance.
Calculations show that a force of 10 tonnes is required to get the block to vertical from its 70 degree resting position.
The volunteer team of 130 people could only generate 6 tonnes.
Therefore, a timber A-frame was used as a lever illustrated on the next panel >