This section is from the book "A Glossary Of English Furniture Of The Historic Periods", by J. Penderel-Brodhurs and Edwin J. Layton. Also available from Amazon: A Glossary of English Furniture of the Historic Periods.
The name given to the ornamental structure surrounding the fireplace and the chimney breast above it. The word "mantelpiece," from the old French mantel (modern manteau, mantle), is sometimes used instead of chimney piece. Its main features consist of the architrave or pilasters, jambs, lintel, shelf (mantel shelf) and the superstructure above masking or partly masking the chimney breast. In this form it was called a " continued" piece and the horizontal shelf, usually present, divided the piece into an upper and lower storey. When the upper storey was omitted it was called a simple or one-storey piece. The upper storey generally included a frame for applied carving, painting, or mirror, etc. Inigo Jones (1573-1651) designed both "continued" and "simple" pieces. Sometimes a simple piece would have some feature above it which in modern parlance would be called an overmantel. From the Restoration period the simple piece was more generally favoured and by the time of Sir William Chambers (1726-1796) the "continued" piece was almost a thing of the past. Owing to the climate more attention was necessarily given in England than in warmer countries to the decoration of the fireplace, and English architects, sculptors and wood-workers may be given the entire credit for the very beautiful chimney pieces which they designed or produced in the eighteenth century.
 
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