Permanent Magnetic Drum

A magnetic drum is a magnetic storage device used in many early computers as the main working memory, similar to how modern computers use random access memory (RAM) cards. In some cases, magnetic drum memory was also used for secondary storage.As the drum revolves, it carries the material through the stationary magnetic field. The nonmagnetic material falls freely from the shell, while the magnetic particles are held firmly until they are carried out of the magnetic field.Two categories of equipment are low intensity and high intensity magnetic separators. Low intensity separator is used primarily for ferromagnetic materials and for paramagnetic materials of high magnetic susceptibility. High intensity separators are used for paramagnetic materials of lower magnetic susceptibility.