Not a true truss the construction is similar to corbeled masonry see corbel in that each set of beams steps upward and inward by resting on the ones below by means of curved braces and struts. They are traditionally timber framed using short beams projecting from the wall on which the rafters land essentially a tie beam which has the middle cut out. The hammer beam roof is the crowning achievement in english gothic architecture and open timber roof design. 
				
			
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