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Encyclopedia Britannica



TREBUCHET

This article appears in Volume V27, Page 233 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: TOO-TUM
TREBUCHET , a medieval siege
engine
 , employed either to
batter
  masonry or to throw projectiles over walls. It was developed from the post-classical Roman onager (wild ass), which derived its name from the kicking action of the
machine
 . It consisted of a
frame
  placed on the ground to which a vertical
frame
  of solid timber was rigidly fixed at its front end; through the vertical frame ran an axle, which had a single stout spoke. On the extremity of the spoke was a Cup to receive the projectile. In action the spoke was forced down, against the tension of
twisted
 
ropes
  or other springs, by a windlass, and then suddenly released. The spoke thus kicked the crosspiece of the vertical frame, and the projectile at its extreme end was shot forward. In the trebuchet the means of propulsion was a counter-
weight
 . The axle which was near the top of a high strutted vertical frame served as the
bridge
  of a
balance
 , the shorter arm of which carried the counter-
weight
  and the longer arm the
carrier
  for the shot. An alternative name for the trebuchet is the mangonel (mangonneau).


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