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The apparatus commonly used for radiographing aircraft castings and forgings was inherited from medical diagnostic radiography. One part of this inheritance was a cassette design consisting of bakelite, felt, fluorescent screens, and a brass frame. Such a design is most unsuitable for aircraft radiography. This fact probably has been realized by the many industrial radiographers who have been using aluminum front cassettes, but present restrictions on supplies may re-introduce objectionable bakelite fronts or other detrimental arrangements in homemade cassettes.
Ball, L. W.
Research Physicist, Triplett & Barton, Inc., Burbank, Calif