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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!