References 1 Stewart, R. B. and Wallio, M. A., The Experimental Performance of an Arc Driven Vortex Type Heater Accelerator, Proceedings of the Fourth Hypersonic Technology Symposium, Tullahoma, Tenn., 1965, pp. 172-206. 2 Stewart, R. B., An Analysis of an Electromagnetically Driven Confined Vortex with High Positive Radial Reynolds Numbers, AIAA Paper 67-730, Colorado Springs, Colo., 1967. 3 Sabol, A. P., Stewart, R. B., and Duckett, R. J., An Experimental Study of the Behavior of High Current Arcs Driven by Strong External Magnetic Fields, Proceedings of the Eighth Symposium on Engineering Aspects of MHD, March 1967, pp. 130-131. 4 Finkelnburg, W. and Maecker, H., Electrische Bogen und Thermisches Plasma, Encyclopedia of Physics, transl., Vol. XXII, Gas Discharges II, Springer-Verlag, 1956.