1. Unique Wire Weaving Co., Inc., 762 Ramsey Avenue, Hillside, NJ 07205–1094; Electronic Space Products International, 1050 Bensen Way, Ashland, OR 97520.
2. D.A. Shaw and D.A. Bennett, Rev. Sci. Instrum. 43, 1706 (1972).
3. P.A. Taylor, J. Vac. Sci.Technol. A6, 2583 (1988).
4. J. Koch, Rev. Sci. Instrum. 45, 1212 (1974).
5. P.W. Palmberg, D.C. Johnson, and H.J. Boll, Rev. Sci. Instrum. 35, 244 (1964).