Hammer-beam n. : 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.

Example:


Taxonomy
hammerbeam roof, roof, hall, Westminster Hall, Great Hall, braces, free encyclopedia, collar beam, England, open timber roof, span, beams, trusses, The Hammer, the wall, timber, train shed, hammer-beam.

Defination from the web:
Hammer-beam) Jump to: navigation, search. Westminster Hall in the early 19th century. On a smaller scale, here is a view of a hammer beam inside a timber frame residence. The restored new hammerbeam roof in the Great Hall at Stirling Castle. ...