Abstract: A clamp assembly to effectively lock and or prevent a wheel on a trailer or like wheeled vehicle from rotating to in turn prevent the unauthorized movement or theft of the trailer including two clamp members movable towards and away from one another and wherein each clamp member is disposed in overlying and or confronting engagement with either the front face or rear face of the wheel. The two clamp members may be positioned and locked into an operative position such that the various components of the two clamp members adapted to collectively surround a peripheral or tread portion of the wheel are positioned such that rotation of the wheel is impossible due to the fact that the clamp assembly will eventually come into contact with the undercarriage of the vehicle upon attempted rotation of the wheel through unauthorized movement of the trailer.

Abstract: Drag in turbulent aqueous streams is reduced by a powder composition of a finely divided hygroscopic drag reducing powder, for example poly(ethylene oxide), and a colloidal size hydrophobic powder, for example, an organosilicon modified colloidal silica, and an inert filler such as sodium sulphate. The powder composition is injected into the turbulent stream by first mixing the powder with water to form a slurry and immediately thereafter drawing the slurry through an eductor into a recycle stream between the downstream and upstream ends of a pump for the turbulent stream.