Word: 70mm
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...receivers covering the frequency ranges 100-800, 180-320, and 320-580 megacycles. Later three more receivers were added: 25-50, 50-100, and 2,000-4,000 megacycles. The six cathode ray screens are mounted one over another, with the highest frequencies at the bottom, and photographed with 70mm film which slowly winds past the display screens at the rate of 2.5 feet per hour. When the 100 foot rolls of film are later developed in Fort Davis, they give a permanent visual record of solar radio activity...