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( Miquel Ramis)
Seasoning Stone. - Stone freshly quarried
is full of sap, and thus admits of being easily worked.
On being exposed to the air the sap dries out, and the
stone becomes much harder in consequence. For this reason,
and because carriage charges are lessened by the smaller
bulk of the worked stone as compared with the rough
block, the stone for a building is often specified to
be quarry-worked.
Vitruvius recommended that stone should
be quarried in summer when driest, and that it should
be seasoned by being allowed to lie two years before
being used, so as to allow the natural sap to evaporate.
In the erection of St Paul's Cathedral,
Sir Christopher Wren required that the stone after being
quarried should be exposed for three years on the sea-beach
before its introduction into the building.
http://www.1911encyclopedia.org/Masonry
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