Pencil sharpener pencil in position, although they then sharpen them to the usual conical point as for a round pencil, abandoning some distinctive aspects of the carpenter's pencil. Sharpeners with a single blade for use on wax crayons are available, and sometimes included in boxes of crayons. These often have plastic blades, which are adequate for the soft wax. Mechanical pencils dispense the graphite lead progressively during use and thus do not require sharpening; such pencils are sometimes called "self-sharpening". A type of mechanical pencil has a rotating gear mechanism which rotates the lead slightly every time the lead is lifted off
Lead (leg) So when an animal is in a rotatory gait, it is called disunited, due to different leading legs in the front and hind. A horse is better balanced when on the correct "lead" of the canter, that is to say, the lead which corresponds to the direction of travel. If a horse is on the wrong lead, it may be unbalanced and will have a much harder time making turns. However, there is an exception to this general rule, the counter canter, or counter-lead, a movement used in upper-level dressage, where a horse may be deliberately asked for what would