The monument includes the remains of a medieval glassworks within Bishop’s Wood. The glasswork site includes the remains of a rectangular glasshouse and is built from sandstone and glacial erratic boulders on a raised plinth. It includes the remains of a furnace with a central flue and 4 internal crucibles and an adjacent working area. The monument was excavated in 1931-32 and restoration was carried out in 1933 when a wooden shed was erected over it (which no longer remains). The glassworks were in use from 1580 when Bishop Overton brought glass workers with him from Hampshire until 1615 when legislation was passed which prohibited the use of wood in the manufacture of glass.
https://historicengland.org.uk/listing/the-list/list-entry/1006087
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