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3. See AIP document number PAPS RSINA-62-2884-25 for
25 pages of detailed figures and material which supplement this article. Order by PAPS
number and journal reference from American Institute of Physics, Physics Auxiliary
Publication Service, 335 East 45 Street, New York, NY 10017. The price is $1.50 for each
microfiche or $5.00 for photocopies. Airmail additional. Make checks payable to the
American Institute of Physics.
4. W. Kohl, Materials and Techniques for
Electron Tubes, and references therein (Reinhold, Stamford, CT, 1960), Chap.
15.