(under subclass 213) Devices wherein the magnetic attracting element or elements constitute or form part of a hollow rotating cylinder or drum, and material to be separated is delivered to the interior of such drum or cylinder, and the magnetizable constituents are attracted to the magnetic elements and detained or diverted from nonmagnetizable constituents.
(1) Note. Part or all of the rotating cylinder or drum must be magnetized, devices in the form of hollow cylinders or drums serving as shields or conveyors adjacent magnets, but no portion of which is magnetized to operate directly as attracting means, not being included.
