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Plug and feathers
- used in splitting stone.
A row of holes called pool holes are drilled into which the feathers, two
tapering strips of metal, curved in section, are inserted. A spike, which is the plug, is inserted
between them and evenly hammered along the row of holes. The feathers are forced apart, and
the stone splits.
Formally, oak wedges were used which, once inserted into the holes were soaked
in water and the resultant expansion caused the stone to split. Plugs and feathers were faster!