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Abstract
In this paper a general outlook on high speed magnetic printing process (ferrography) is presented.
The ferrographic process begins from magnetic recording of image to be printed on a magnetic drum or a tape. A multichannel assembly of miniature recording heads used along with an electronic sign generator allows to record images of any kind: figures, letters, plots, drawings, maps, etc., in their natural forms.
The dry magnetic powder, for example iron powder with small particles (10–20 mk) can develop latent magnetic image with good resolution and without noticeable inertia, resulting in very high speed of process.
The final stage of process is a transfer of the powder image from the magnetic drum or tape developed to a paper with fixing the powder image on it. Some prototypes can print 0·5–1 million digits per minute.
Possibilities to obtain half-tones, multi-colour images, to copy and reproduce them magnetically are discussed.