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The noseband and curb chain are connected by a metal link that also includes the long shank that applies pressure to the nose, chin groove and poll when the reins are tightened. The mechanical hackamore is unrelated to a hackamore except to the extent that both are headgear that control a horse with some form of noseband rather than a bit in ...
The revolutionary underlying principle was that advances in machine tool control that expedited the making of jigs were fundamentally a way to expedite the cutting process itself, for which the jig was just a means to an end. Thus, the jig borer's development helped advance machine tool technology toward later NC and CNC development. The jig ...
Pelham bridle: The Pelham is another English type bridle that carries a single bit, in this case a Pelham bit, but two sets of reins, one for snaffle action and one for curb action. Double bridle: Also called a Weymouth bridle, a double bridle uses two bits at once: a small snaffle called a bradoon and a curb or Weymouth bit. It requires the ...
The double bridle differs from the usual snaffle bridle in that it consists of four reins attached to two separate bits: the bradoon-style snaffle and a curb. The curb bit hangs down from the main headstall, and the bradoon has a separate, simpler headstall made from a narrow piece of leather known as a "bradoon hanger" or a "slip head."
If the bit has a 1.5" cheek and a 4.5" lower shank, thus producing a 1:3 ratio of cheek to lower shank, while the ratio of the cheek to (upper + lower) shank is 1:4, and producing 4 pounds-force of pressure on the horse's mouth for every 1 pound-force (4 newtons per newton) placed on the reins.
A curb bit works on several parts of a horse's head and mouth. The bit mouthpiece acts on the bars, tongue and roof of the mouth. The shanks add leverage and place pressure on the poll via the crownpiece of the bridle, to the chin groove via the curb chain, and, especially with a "loose jaw" shank, may act on the sides of the mouth and jaw.