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Magnetic fluid rotary Seals have been used for many years in different environments. The prototypical seal device of this type is described in US Pat. No. 3,620,584. A com prehensive review describing numerous applications and modifications of the Seal is presented in Chapter 5 authored by Kuldip Raj in Magnetic Fluids and Applications Handbook, B. Berkovski, Ed., Begell House, Inc., New York (1996). A treatment describing the Synthesis, make-up, fluid and magnetic properties, and flow of magnetic fluids is given in the monograph Ferrohydrodynamics, RE RosenSweig, Cambridge University Press, New York (1985), reprinted by Dover Publications, Inc., Mineola, NY (1997). AS Stated in the aforementioned publications, and as used herein, a magnetic fluid is an ultra-Stable colloidal disper Sion of approximately 10 nm size magnetic particles in a liquid carrier. Such colloidal magnetic fluids are also known as …