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RALPH MORRISON is a consultant and lecturer in the area of interference control and electronics. He has thirty years of design and consulting experience, was president of Instrum for over a decade, and has authored "Noise and Other Interfering Signals" (1991), "Grounding and Shielding in Facilities" (1990), and the highly popular "Grounding and Shielding Techniques in Instrumentation" (1986).