Very high speed 450 pages-per-minute experimental magnetic printer

Starting from the MP magnetographic technology an experimental research program has been conducted to assess the potential of the technology for extension to much higher speeds. The magnetic shunt of the MP drum media was found to be the most limiting factor to significant speed increase. Characterization of various experimental media, in terms of write time constant, permitted to come up with a new 'fast' drum structure. As a result, a full function, 8 1/2 inch-wide, experimental magnetic printer was built and tested up to speeds of 450 pages per minute.