· In the late 18th century, Oliver Evans invented the first automated flour mill in the United States that did the work of seven men (Basey 7). It used millstones, had an enormous amount of levers and pulleys, and was very noisy. Evans' mills were water powered, so they were situated along rivers.
· 4. Colloid mill is used for grinding, dispersing and homogenizing of ointment, cream, gels, and high viscous fluids in one operation. Advantages of Colloid Mills. 1. It has a wide range of use including comminution of slurry fluid materials. 2. No pressure is required for ionization. 3. The machine is simply constructed.