Mutagen vs Carcinogen Mutagen and carcinogen are two terms that have a lot in common. There is a potential that a single substance could be both of them at the same time and be only one of the two, as well.
A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along with the traditional curb bit used mainly by Western riders. Kimblewicks or Kimberwickes are modified curb bits, and a curb bit is used in a double bridle along with a bradoon.
When designing a curbed roadway, engineers specify the reveal or lip. The reveal is the height of the section that is visible (revealed) above the pavement surface. Typical reveals are in the 4 to 8 inches (100 to 200 mm) range.