Action
A pelham works on several parts of a horse's head, depending on which rein is applied. The mouthpiece acts when either the snaffle or curb rein is applied and puts pressure on the bars, tongue, and lips of the horse. The curb chain and design of the mouthpiece can alter the degree of pressure placed on the horse's mouth. The roof of the mouth is affected if the bit mouthpiece of the pelham has a high port or if it is jointed. Pressure on the poll occurs when the curb rein is engaged, and pressure is directly related to the length of the upper shank (purchase arm) in relation to the lower shank (lever arm). All pelhams apply some pressure on the poll. Pressure is applied to the chin groove by the curb chain when the curb rein is used. Direct rein pressure from the snaffle rein may put some pressure on the sides of the horse's mouth, depending on the specific bit design.
Read more about this topic: Pelham Bit
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