And there were times when it was impossible to use brute force, men raised heavy rocks either with a help of group or animals, and dropped. When man invented the irrigation systems, he used water to raise rocks for crushing materials. At times sledge hammers were also employed for the same purpose. The hammer mill crusher was initially come in limelight in 1920 and was serving sole purpose of breaking stone by its impact force. This box-shaped device was equipped with a shaft in the center, which rotated mounted hammers and a set of grates. The objective behind intending this device was to break stone by developing high speed impact.