Definition.—The double bridle is one with usually four cheek straps, which fasten, one into the eye of the curb bit the other into the ring of the snaffle bit.
The curb bit is nearer the front of the horse’s mouth than the snaffle, and the curb chain likewise passes in front of the snaffle bit.
The Severity of the Curb Bit Increases—
1. With the difference between the length of the upper and lower branches.
2. With the tightness of the curb chain.
3. With the height of the port.
4. Inversely with the size of the canons. (De Saint-Phalle.)
Bits with branches similar in length to the U. S. regulation bit are arranged below in order of mildness:
1. The broken curb bit. (Like a snaffle bit, but with upper and lower branches and curb chain.)