Using a cold cathode gauge in gases with substantial organic components, such as pump oil fractions, can result in the growth of delicate carbon films and shards within the gauge that eventually either short-circuit the electrodes of the gauge or impede the generation of a discharge path.
32.
The thumb wheel on the ribbon cartridge and the correction tape spools were color-coded so they could be easily identified and matched with the appropriate correction tapes : Yellow for the correctable film ribbon and Lift-Off tape; gray, pink, and blue for cloth, carbon film, and Tech-3, respectively.
