A Blake’s hitch is similar to the prusik hitch and the klemheist in that they are all gripping/sliding knots. Where the Blake’s hitch differs is that rather than being tied on a loop or bight of rope, the Blake’s hitch is tied with the end. Like the klemheist, load should only be placed in one direction. For this reason, the prusik is preferred. Wrap the end four times or more around the rope. Then take the end and pass it through a couple of the further loops. Pull tight. When not under load the Blake’s hitch can become loose. Secure the loose end with a safety knot to reduce the risk of the hitch becoming undone. See here for knot terminology.