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n.1.(Gothic Arch.) A member of one description of roof truss, called hammer-beam truss, which is so framed as not to have a tiebeam at the top of the wall. Each principal has two hammer-beams, which occupy the situation, and to some extent serve the purpose, of a tiebeam.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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"The nave and its hammerbeam roof is 15th century, although restored, while the chancel and its roof are 19th century.
In the heart of Parliament sits Westminster Hall, the 921-year-old, echoing ancient gathering place and courtroom with a hammerbeam roof and so much history in it you can almost see it ooze from the 6ft-thick walls.
Mr Marsden said the church building had many fine features worth preserving, including stone carvings made by Thomas Earp of London and 'hammerbeam roof' which is a decorative, open timber roof truss which is typical of English Gothic architecture.
The upper room, which has a hammerbeam roof was built in 1641.
Buchanan Street is also home to the Argyll Arcade with its ornate iron-framed hammerbeam roof. One of the UK's oldest covered shopping areas there are more than 30 jewellers' shops, both modern and antique.